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Your OvuSense questions answered

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Technical questions about OvuSense Sensor and App

  • OvuSense is available for Android and Apple devices.

    OvuSense is compatible with Android devices that have built in NFC (near field communication). However, please note that OvuSense is not compatible with Huawei P8 or P9 models.

    For Apple devices, OvuSense is compatible with the following models running iOS version 8 or later:

    • iPhone: 5 and 6 models with direct audio connection or lightning to audio adapter connected to NFC Reader supplied on request at checkout
    • iPhone: 7, X and later models with built in NFC (near field communication)
    • iPad: All models with direct audio connection to NFC Reader supplied on request at checkout
  • Over a number of years, clinical studies have identified that a sustained rise in temperature is associated with ovulation [1].  OvuSense builds on this original clinical work with a set of new methods which predict and confirm the date of your ovulation in each cycle.   OvuSense is specifically looking for a sustained rise in your average Core Body Temperature (CBT).  In general, an increase of at least 0.3 degrees Celsius over three days indicates ovulation, though your pattern may vary. When OvuSense detects an ovulation date, it’s doing so on the basis of matching your current cycle pattern against the pattern proven in our clinical studies. If you have not received a confirmed date of ovulation then there are insufficient data to provide evidence that ovulation has occurred in this particular cycle. You may still see that a rise has occurred, and that could mean you have in fact ovulated but the rise was too “slow” to trigger the detection rule.

    [1] Barrett JC Marshall J (1969); McCarthy and Rockette (1983)
  • A realtime OvuSense prediction notifies you in advance during your cycle that ovulation may be about to happen, and a confirmation notifies you that ovulation has happened. OvuSense uses two separate methods for prediction and detection.

    Along with your prediction, OvuSense will show a green shaded area of your “ovulation window” on your graph, with the predicted day of ovulation shaded as a blue vertical line. The ovulation window is the four days immediately around ovulation, from one day before until two days after ovulation.

    The prediction method has a clinically proven sensitivity of 89% meaning that it picks up 89/100 ovulations in advance, but a positive predictive value of 96% which means that 96/100 predictions it makes are correct. Combining the data gives an overall accuracy figure of 89% [1]. The algorithm was deliberately designed not to give you the false hope of an ovulation if it might be wrong and that’s why it misses out some ovulations, but is good at getting them right when it does show one. The prediction message appears up to one day in advance of ovulation.

    OvuSense detection has a sensitivity of 99% meaning it picks up all by 1 in every 100 ovulations, and a positive predictive value of 100% meaning it’s gets them all right. Combining the data gives an overall accuracy figure of 99% [1]. The detection message is displayed 2-5 days after you have ovulated, by which time it has much more data to make the calculations and that’s the reason why it’s able to pick up more ovulations, more accurately.

    [1] The accuracy of ovulation confirmation by OvuSense is based on the data set originally published at the 2013 ASRM meeting as a quality index: Papaioannou S, Aslam M (2013), and developed in the key publication outlining the accuracy, sensitivity and positive predictive value of advance prediction of ovulation shown at the 2014 ESHRE meeting: Papaioannou S, Delkos D, Pardey J (2014).
  • The Fertile Window is shown from cycle 2 onwards if you received confirmed ovulation in the previous cycle. The Fertile Window is shown on your graph as an orange shaded area, with the predicted day of ovulation shaded with a blue vertical line. This window is the eight days when you are most likely to be able to conceive, from five days before ovulation until two days after ovulation. The window is based on the day of ovulation from the previous cycle, so if your cycles vary in length it will be less useful to you.

  • If you have a fever for two or more days you should stop using OvuSense until you are feeling better again. A short fever may show as a ‘spike’ in temperature on your chart. However, OvuSense has been designed with an intelligent filtering system that excludes ‘spikes’ when calculating ovulation so it should not affect your results. If it helps you to remember, mark the fever in your OvuSense App events but note that this information is not used by the OvuSense algorithm to change the calculations.

  • If you drink a regular amount of alcohol each night, then your temperature is usually stable from night to night. However, if you consume more alcohol on one or two nights than your usual intake, this may cause a rise in temperature. OvuSense has been designed with an intelligent filtering system that excludes ‘spikes’ when calculating ovulation, but the 'spikes' in temperature related to alcohol tend to be lower than a fever and can sometimes cause an ovulation result. If you're unsure whether your results have been affected click on this link and fill out the support form.

  • Correct use of hormonal contraceptives should stop you from ovulating, so you will see no temperature rise associated with ovulation, and OvuSense is unlikely to provide an ovulation prediction and confirmation.

    You may still get a positive ovulation result with OvuSense if you're using an IUD, as these tend not to alter the hormonal pattern unless they also contain hormonal implants. In both cases as the IUD disrupts the lining of the uterus no implantation will take place, hence you cannot conceive and the result from OvuSense is therefore of no consequence in trying to conceive.

    However, it should be understood that hormonal and IUD contraceptive use is strongly discouraged while using OvuSense as the results will be invalidated.

    It takes the female body a varying amount of time to re-establish a normal hormone balance after you stop hormonal methods of contraception or have an IUD removed. The length of time it takes depends on the type of contraceptive and your individual body. As the hormone patterns start to normalize, regular menstruation will return and eventually so will ovulation. However, this may take up to 9 months with hormonal methods. During this time, OvuSense may be able to help by showing you whether you are ovulating, but the fertile window prediction may be of less use, as the cycle length and ovulation timing is likely to vary greatly, especially in the first three cycles.

  • As OvuSense takes temperature measurements in the vagina, it is not prone to external influences. It also takes a measurement every 5 minutes throughout the night and has been designed with an intelligent filtering systems that removes “spikes” in the data.

  • Devices that measure temperature for the purpose of determining ovulation use very different measuring technology in different locations in and on the body - you therefore shouldn't expect them to give you the same temperature result. Although based on the same principle, they also use different methods for determining when ovulation takes place. So the day of ovulation may also vary between methods. You should also be aware that a vaginal temperature is generally up to two degrees Celsius higher than an oral temperature reading, and higher still than other external temperature readings (such as those taken under the armpit or on the skin). So don't worry necessarily if you appear to have a 'slight fever' - your core body temperature is not the same as your oral temperature. Here's a detailed explanation of each of the methods and their reported accuracy:

    The Basal Body Temperature (BBT) method relies a single measurement of oral temperature taken first thing on waking to estimate the lowest (basal) temperature in a 24 hour time span. Charting BBT each day can help determine when ovulation takes place using the 3 over 6 rule long established in the literature [1]. This rule looks for a sustained rise in temperature over 3 consecutive days above the level of the previous 6 low temperatures. In general a 0.3 degree Celsius rise over that time span shows that ovulation took place. There are a number of drawbacks to the method: oral thermometers only have a measuring resolution of around 0.1 degrees Celsius [a], there is only a single measurement in each 24 hour period, the measurement is not actually at night when temperature is at its most stable, and oral temperature can fluctuate in a way which doesn't correctly represent core body temperature, particularly for the 70% of women with irregular ovulation timing [2]. Studies assess accuracy [b] for confirmation that ovulation took place with BBT at around 69%-83%[3].

    OvuSense solves the issues with the other methods by taking multiple overnight Core Body Temperature (CBT) measurements in the vagina using a thermistor with a resolution of 0.003 degrees Celsius [a], and the OvuSense algorithm then intelligently filters the data to provide the truest representation of the action of progesterone on the ovaries. OvuSense confirms the date of ovulation with 99% accuracy [b][4]. Unlike the other methods it is also able to predict ovulation in real time - the published literature shows it does this with an accuracy of 89% and a positive predictive value of 96% [c][4].

    [a] The measuring resolution of a thermometer is the step between each temperature reading - a resolution of 0.1 degree Celsius means a reading may be wrong by as much as 0.099 degrees Celsius, or in other words there are only 3 steps between a wrong and right ovulation result of 0.3 degrees Celsius rise, whereas 0.003 degrees resolution provides 100 steps.
    [b] The accuracy measures how many positive and absent ovulations the device confirms correctly.
    [c] The positive predictive value measures how many of the real time predicted ovulations OvuSense gets right.
    [1] Barrett JC Marshall J (1969); McCarthy and Rockette (1983)
    [2] Baird D, McConnaughey D (1995) Lenton EA, Landgren BM (1984a); Lenton EA, Landgren BM (1984b)
    [3] Freundl G, Godehardt E (2003); Barron M L Fehring R (2005); Bauman JE (1981)
    [4] The accuracy of ovulation confirmation by OvuSense is based on the data set originally published at the 2013 ASRM meeting as a quality index: Papaioannou S, Aslam M (2013), and developed in the key publication outlining the accuracy and positive predictive value of advance prediction of ovulation shown at the 2014 ESHRE meeting: Papaioannou S, Delkos D, Pardey J (2014).

  • Devices that measure temperature for the purpose of determining ovulation use very different measuring technology in different locations in and on the body - you therefore shouldn't expect them to give you the same temperature result. Although based on the same principle, they also use different methods for determining when ovulation takes place. So the day of ovulation may also vary between methods. You should also be aware that a vaginal temperature is generally up to two degrees Celsius higher than an oral temperature reading, and higher still than other external temperature readings (such as those taken under the armpit or on the skin). So don't worry necessarily if you appear to have a 'slight fever' - your core body temperature is not the same as your oral temperature. Here's a detailed explanation of each of the methods and their reported accuracy:

    A more modern application of the BBT method is to take several consecutive temperature measurements on the skin at various intervals overnight, and then download and interpret these measurements on an app. As with the BBT method, a skin worn device placed under the armpit, by the bra strap, or on the wrist is a relatively easy way to track your temperatures and it's often more convenient. The devices help establish the pattern of temperature over time, and because of the volume of measurements, they are possibly a little more consistent in detecting ovulation than BBT with an oral thermometer. Unfortunately measuring temperature at the skin also has some negative aspects - firstly the skin temperature tends to vary in opposition to core temperature changes associated with the release of progesterone, and secondly there is a high chance of 'dropouts' in the temperature signal because it's difficult to maintain contact between the skin and sensor consistently. So skin temperature can also be less reliable than BBT, and the resolution [a] of the device cannot change this. Again, this is particularly an issue for the 70% of women with irregular ovulation timing [1]. Published data show an accuracy [b] of 86-89% [2,3].

    OvuSense solves the issues with the other methods by taking multiple overnight Core Body Temperature (CBT) measurements in the vagina using a thermistor with a resolution of 0.003 degrees Celsius [a], and the OvuSense algorithm then intelligently filters the data to provide the truest representation of the action of progesterone on the ovaries. OvuSense confirms the date of ovulation with 99% accuracy [b][4]. Unlike the other methods it is also able to predict ovulation in real time - the published literature shows it does this with an accuracy of 89% and a positive predictive value of 96% [c][4].

    [a] The measuring resolution of a thermometer is the step between each temperature reading - a resolution of 0.1 degree Celsius means a reading may be wrong by as much as 0.099 degrees Celsius, or in other words there are only 3 steps between a wrong and right ovulation result of 0.3 degrees Celsius rise, whereas 0.003 degrees resolution provides 100 steps.
    [b] The accuracy measures how many positive and absent ovulations the device confirms correctly.
    [c] The positive predictive value measures how many of the real time predicted ovulations OvuSense gets right.
    [1] Baird D, McConnaughey D (1995) Lenton EA, Landgren BM (1984a); Lenton EA, Landgren BM (1984b)
    [2] Freundl G, Godehardt E (2003); Barron M L Fehring R (2005); Bauman JE (1981)
    [3] Stein P, Falco L (2016)
    [4] The accuracy of ovulation confirmation by OvuSense is based on the data set originally published at the 2013 ASRM meeting as a quality index: Papaioannou S, Aslam M (2013), and developed in the key publication outlining the accuracy and positive predictive value of advance prediction of ovulation shown at the 2014 ESHRE meeting: Papaioannou S, Delkos D, Pardey J (2014).

  • Devices that measure temperature for the purpose of determining ovulation use very different measuring technology in different locations in and on the body - you therefore shouldn't expect them to give you the same temperature result. Although based on the same principle, they also use different methods for determining when ovulation takes place. So the day of ovulation may also vary between methods. You should also be aware that a vaginal temperature is generally up to two degrees Celsius higher than an oral temperature reading, and higher still than other external temperature readings (such as those taken under the armpit or on the skin). So don't worry necessarily if you appear to have a 'slight fever' - your core body temperature is not the same as your oral temperature. Here's a detailed explanation of each of the methods and their reported accuracy:

    Fertility tracker apps use the calendar based method of tracking. You input the dates of your period and the app will calculate your ovulation based on the assumption that you have 'middle of the month' ovulation. Some have more sophisticated algorithms which accept manually entered oral temperatures, or Luteinizing Hormone (OPK) test results. Fertility apps are convenient and a handy way of tracking the basic information in your cycle. They help you stay organised and often feature useful extra information to help with conception and pregnancy. However, a recent study concluded 'accuracy of ovulation prediction [using previous cycle data] was no better than 21%' [1]. Other studies have drawn similar conclusions [2]. It's really important to understand if you input your OvuSense result into a Fertility tracker app that it will not give you the same result as OvuSense because they do not use the OvuSense algorithm. Please note therefore that inputting OvuSense data into a Fertility tracker app is strictly discouraged as it invalidates the results from your OvuSense sensor.

    OvuSense solves the issues with the other methods by taking multiple overnight Core Body Temperature (CBT) measurements in the vagina using a thermistor with a resolution of 0.003 degrees Celsius [a], and the OvuSense algorithm then intelligently filters the data to provide the truest representation of the action of progesterone on the ovaries. OvuSense confirms the date of ovulation with 99% accuracy [b][3]. Unlike the other methods it is also able to predict ovulation in real time - the published literature shows it does this with an accuracy of 89% and a positive predictive value of 96% [c][3].

    [a] The measuring resolution of a thermometer is the step between each temperature reading - a resolution of 0.1 degree Celsius means a reading may be wrong by as much as 0.099 degrees Celsius, or in other words there are only 3 steps between a wrong and right ovulation result of 0.3 degrees Celsius rise, whereas 0.003 degrees resolution provides 100 steps.
    [b] The accuracy measures how many positive and absent ovulations the device confirms correctly.
    [c] The positive predictive value measures how many of the real time predicted ovulations OvuSense gets right.
    [1] Johnson S, Marriott L (2018)
    [2] Freundl G, Godehardt E (2003); Moglia ML, Nguyen HV (2016); Wise LA, Hatch EE (2015)
    [3] The accuracy of ovulation confirmation by OvuSense is based on the data set originally published at the 2013 ASRM meeting as a quality index: Papaioannou S, Aslam M (2013), and developed in the key publication outlining the accuracy and positive predictive value of advance prediction of ovulation shown at the 2014 ESHRE meeting: Papaioannou S, Delkos D, Pardey J (2014).

  • Ovulation Predictor Kits (OPKs) and Ovulation Prediction Monitors (OPMs) provide a positive test for Luteinizing Hormone (LH) using a urine test strip. LH peaks 24-48 hours in advance of ovulation so they are helpful in providing a short term indication of when you should try and conceive based on your current cycle data. They work well at predicting ovulation for most women that have regular 'middle of the month' ovulation. OvuSense will also predict ovulation up to a day in advance and a positive OPK and OvuSense prediction within a day of each other is a very good sign that you're about to ovulate. However, OPKs and OPMs are known to give false positive results for women with PCOS and other ovulatory issues [1], and it is not uncommon for these to occur very early in the cycle causing confusion. They sometimes also give false negative results, which can be based on the cutoff point of the test, or simply that the test is not optimised for the natural level of LH for the particular user. These devices can only provide a snapshot at one point in time in your cycle, meaning you have to use a minimum of two tests a day over a 10-20 range in each cycle to monitor where you are in your cycle. The manufacturers make valid claims for 99% accuracy in detecting LH, and some even show you the quantitative result, but the accuracy estimates for correct advance prediction of ovulation are 70%-84% depending on the publication [2]. Crucially, these devices are not able to confirm the date of ovulation or if you haven't ovulated.

    Unlike OPKs and OPMs, OvuSense provides a clinically accurate prediction and detection of the exact date of ovulation day for all women regardless of whether they have ovulatory issues. [3] OvuSense® Pro can also help your clinician monitor your cycles remotely, to understand what additional diagnostic tests may be necessary, and to track your medications and treatments.

    [1] McGovern PG, Myers ER (2004)
    [2] Irons DW, Singh M (1994); Lloyd R, Coulman CB (1989)
    [3] The accuracy of ovulation confirmation by OvuSense is based on the data set originally published at the 2013 ASRM meeting as a quality index: Papaioannou S, Aslam M (2013), and developed in the key publication outlining the accuracy and positive predictive value of advance prediction of ovulation shown at the 2014 ESHRE meeting: Papaioannou S, Delkos D, Pardey J (2014).

  • Usually, your doctor will carry out one of two tests to determine if and when you ovulated.

    The most common test is serum progesterone, often called '21 day progesterone'. The value of serum testing has long been established, with a 'serum concentration of greater than 3 ng/ml' providing 'presumptive but reliable evidence of recent ovulation'. [1] In Europe the cut off is generally expressed in nmol/l where >30nmol/l is indicative of ovulation. However, blood tests are inconvenient for the clinic and patient, and will always suffer from issues of timing of the blood draw even in a patient with a regular cycle – with false negatives proving a common issue. The ASRM (American Society Reproductive Medicine) guidelines go on to state that 'a serum progesterone measurement generally should be obtained approximately one week before the expected onset of the next menses, rather than on any one specific cycle day (e.g. cycle day 21).'

    This test cannot predict when you are about to ovulate in a cycle at all, and cannot provide a particularly reliable date of ovulation after the event either, as progesterone levels vary quite widely between women and from cycle to cycle, meaning that a positive result can occur over a 2-3 span. If the test is positive, there is a generally held view that ovulation occurs 7 days before the test is carried out which means day 14 in a woman with a 28 day cycle, but this is a much less reliable indicator than OvuSense as a serum progesterone result is only a spot test. It is also important to know that a negative serum progesterone result does not necessarily mean no ovulation occurred in that cycle.

    Here is a testimonial from an OvuSense user that shows how it can help in practical terms: “I just thought you may appreciate some positive feedback. After I used Ovusense, I rebooked my ‘21 day’ Progesterone blood test for the week later and the score has now come back as 50…. I am so pleased I invested in Ovusense because for 5 years I have presumed I have ovulated 10 days earlier than I actually do and have struggled to get pregnant. Thank you.” – Alison – October 2014.

    The alternative test is an ultrasound folliculometry scan. 3-4 ultrasound 'folliculometry' scans per cycle is the suggested requirement of good cycle monitoring. Your clinician will usually be looking for a dominant follicle (the next one that is most likely to rupture resulting in ovulation) of 20mm or more in size in one of your ovaries. This measurement means that you are likely to ovulate in the next 24-48 hours. If timed correctly, ultrasound 'folliculmetry' is the accepted gold standard for confirming the likelihood of ovulation in a cycle [1]. It is also essential in assessing the growth and number of follicles, particularly during stimulation of the ovaries, and vital in diagnosis of ovarian issues such as PCOS. However, ultrasound ‘folliculometry’ is not always a good predictor of ovulation, and this isn’t surprising given that it assumes that all women of whatever size and shape, or hormonal make-up will have identically sized follicles just before ovulation occurs. Dominant follicle size can vary greatly [2]. Katiyar et al. (2018) reported on the ability of ultrasound folliculometry to predict ovulation in 100 infertile women, concluding folliculometry predicted ovulation with an accuracy of 86% and a sensitivity of 98.6% [3]. Also, because a scan is a snapshot at one point in time in your cycle, timing the scan correctly is essential, and a number are needed in cycles where the timing of ovulation needs to be known. So the bottom line is if you are predicted an ovulation date with an ultrasound, it may not be accurate, and if you are told you have ovulated it is only an accurate confirmation of the date if a previous scan in the cycle established there was a follicle about to rupture.

    [1] ASRM (2012) Diagnostic evaluation of the infertile female
    [2] Vlaisavljević V, Došen M (2007)
    [3] Katiyar S, Arya S (2018)

  • OvuSense processes 5 minute overnight Core Body Temperature (CBT) measurements using a specially designed algorithm with patented techniques to determine the exact date when ovulation takes place. The Basal Body Temperature (BBT) method relies instead a single measurement of oral temperature taken first thing on waking to estimate the lowest (basal) temperature in a 24 hour time span. Charting BBT each day can help determine when ovulation takes place using the '3 over 6' rule long established in the literature [1]. This rule looks for a sustained rise in temperature over 3 consecutive days above the level of the previous 6 low temperatures and gives you a quick idea of when ovulation might have taken place, but it's only around 86%-89% accurate [2]. OvuSense improves on this original method with the CBT approach, firstly by predicting ovulation before it happens using current cycle data (so long in advance of BBT), and then avoiding a 'false positive' confirmation by checking that the rise in CBT is sustained. Waiting the 2-5 days to confirm is how it can ensure a 99% accurate confirmation of the date of ovulation, which is vital for analysis of the cycle pattern, including whether you have a short luteal phase.[3]

    [1] Barrett JC Marshall J (1969); McCarthy and Rockette (1983)
    [2] Freundl G, Godehardt E (2003); Barron M L Fehring R (2005); Bauman JE (1981)
    [3] The accuracy of ovulation confirmation by OvuSense is based on the data set originally published at the 2013 ASRM meeting as a quality index: Papaioannou S, Aslam M (2013), and developed in the key publication outlining the accuracy and positive predictive value of advance prediction of ovulation shown at the 2014 ESHRE meeting: Papaioannou S, Delkos D, Pardey J (2014).
  • The effect of medications on progesterone (and hence Core Body Temperature) levels in the cycle is predictable, and the likelihood of interference with results from fertility or cycle related medications is greatly reduced as they are generally not taken in the cycle around the time at which ovulation is expected. Most fertility related medications are targeted at creating a positive effect on the process of ovulation and/ or cycle regulation and therefore in fact make Core Body Temperature less likely to fluctuate atypically. OvuSense can also be used to track those positive effects. The exception is progesterone supplementation which may be taken around the time of ovulation, and if this is the case OvuSense may show the resulting progesterone medication related rise in temperature as ovulation – in other words it may produce a false positive result. If you change any medication regime from one cycle to the next, for instance thyroid medication, this may also affect your temperature pattern from one cycle to the next but as OvuSense is designed to look for relative changes in temperature within the cycle this is unlikely to change the prediction or confirmation of ovulation. Ask your doctor if you are unsure as to how the timing and dose of any of your medications may affect your temperature. Your doctor may also be interested in learning more about how OvuSense® Pro can help them monitor your medication. Read more about OvuSense® Pro by clicking here

  • OvuSense can still be used while you are undergoing IUI or IVF treatment and may provide valuable extra information to your clinician including when to time insemination or embryo transfer. IUI treatment may include an hCG 'trigger shot' to induce ovulation. Experience over a number of cycles with OvuSense users shows that OvuSense will often still confirm ovulation but it may do so 1-2 days after the day on which your clinician tells you that ovulation should take place. This is because the temperature curve resulting from the hCG trigger shot is usually a little slower than the one produced by 'natural ovulation'. When undergoing IVF, your hormonal profile is likely to be completely different from your natural unmedicated profile so you should not expect OvuSense to produce accurate ovulation prediction or confirmation. However, the cycle pattern produced by OvuSense may still prove useful to your clinician.

  • NO. OvuSense cannot be used to directly diagnose ovulatory or other issues. However, the results from OvuSense and OvuSense® Pro can be used by a doctor to prompt for further testing, so OvuSense is an AID to diagnosis but does not provide diagnostic results itself.

    The complete detail of your charts, and events such as medication dosage and timing logged in the OvuSense App can be shared with your doctor through the OvuSense® Pro portal. In addition, OvuSense Pro provides automatic recognition of the range of aytpical cycle patterns including unique patterns derived from OvuSense discussed in recent clinical studies. These cycle patterns can aid diagnosis of ovulatory issues, miscarriage risk and possibly pregnancy complications. The Pro system requires a separate subscription and can be accessed via any web browser on a computer or mobile device. Read more about OvuSense® Pro by clicking here

  • No, your mobile device does not need to connect to internet for it to work and connect your Sensor. The OvuSense App will work offline for up to 30 days and you will receive warnings when you need to connect again to the internet to back up your data

    Beyond day 30 all your previous data will be retained by the OvuSense App but you will no longer be able to connect your OvuSense Sensor until you have connected to the internet again.

  • Yes, you can use the OvuSense App for up to 30 days without internet access. See Q: Do I need to be connected to the internet to use my OvuSense App?

Sensor questions/ inserting and cleaning

  • Hold the Sensor where the tail joins the main body. Aim toward the small of your back, and push it up. Once your Sensor is in place, you shouldn’t be able to feel it. If it's painful to sit down or walk around then the Sensor isn't far enough up the vagina. Insert your finger inside the vagina until you feel the Sensor. Push slightly, then do another walking test. The Sensor will never get stuck or lost inside you, there's nowhere for it to go.

  • Perhaps your Sensor isn’t in place. Insert your finger inside the vagina until you feel the Sensor. Push slightly and see if it holds in place. If you are still having problems please contact us by clicking on this link and filling out the support form.

  • No, you should not use the Sensor when you are bleeding or spotting.

  • The Sensor is designed with materials that prevents growth of bacteria. Simply clean with warm water and soap. Do not use sterilizing solutions, alcohol wipes or sanitizing gels as they may damage the Sensor.

  • It is essential to remove the Sensor before sex. We recommend that the Sensor is reinserted after sex, to increase the amount of data collected. If you decide to continue using the Sensor after sex, remember to wash it before reinserting it. The Sensor is designed to discard temperature data which are not within the normal body range so any data collected when not in use will be removed.

  • You do not need to remove the Sensor when going to the bathroom. We recommend you hold the tail just in case it falls out. Or if you prefer simply remove the Sensor before your go to the bathroom and reinsert after. Remember to wash it before reinserting it. The Sensor is designed to discard temperature data which are not within the normal body range so any data collected when not in use will be removed.

Order and Delivery

  • You can purchase OvuSense directly from our website, www.ovusense.com.

    OvuSense is a real-time fertility monitor so can give you accurate information on when you ovulate. Therefore giving you on information on when to have sex to conceive.

Payment

  • To cancel your monthly payments you will need to log in to your PayPal account and do the following:

    1) click 'Profile' in the top right corner

    2) a drop-down menu appears; click 'Profile and Settings'

    3) click 'My Money' in the left-hand panel

    4) click 'Update' to the right of 'My pre-approved payments'

    5) click 'Fertility Focus Ltd' or 'Fertility Focus Inc'

    6) click 'Cancel'

    7) a pop-up window appears; click 'Cancel Profile' You can cancel your monthly payment at any time before the next payment is due.

    If you wish to use OvuSense at a later date you can re-subscribe at any time, please visit our website www.ovusense.com, and purchase a new subscription. Your data will be stored on our database for an indefinite period according to the terms and conditions agreed when you signed up.

  • If you decide to stop your OvuSense subscription then no data can be collected until you re-subscribe. If you wish to use OvuSense at a later date you can re-subscribe at any time, please visit our website www.ovusense.com, and purchase a new subscription. Your data will be stored on our database for an indefinite period according to the terms and conditions agreed when you signed up.

  • Yes, you can purchase a new Sensor from our website by requesting support here request a new sensor Your new Sensor will need to be registered to your App account by clicking on 'Sensor > Register a new Sensor' in the OvuSense App.

  • The Sensor is for your personal use. Sharing it with others may present a hygiene risk. Each Sensor is uniquely registered to an App account, so your friend will need to set up her own account and purchase her own Sensor.

  • At OvuSense, we never promise ovulation or pregnancy. No one can do that as that’s up to you. OvuSense offers you extremely accurate information about your cycles that you can ‘do’ something with, even if that information isn’t great news. OvuSense is the only fertility monitor that will tell you if you have, and have NOT, ovulated each cycle with 99% clinically proven accuracy. Finding out you haven’t ovulated consistently isn’t great news and that’s why we created the ‘OvuSense Ovulation Promise’. If you use OvuSense for 90 cycles in a row, without a confirmed ovulation each time, we will offer you your money back. If you are not ovulating consistently, you need help to get you on your way, so reimbursing you the cost of OvuSense may help towards that. Click here to find out more.

App and data security

  • Data security at OvuSense is the highest priority, your data is stored in an encrypted format in the cloud meaning they are much more secure. The cloud database used complies with strict regulatory guidelines which includes security management as per ISO 27001 and personal data protection as per ISO 27018.

  • The data can only be seen by the users you have chosen to share your data with and the OvuSense Technical Support team. If you contact us with a question, our support team may view your data if doing so is necessary to solve your problem.

    We keep your Personal Information confidential and generally do not disclose it. Please note that we do not sell your Personal Information to any third parties, nor do we share your information to social networks or other public places unless we have received prior consent from you.

How does it work?

Tracking your cycle in real time

Cycle 1

Start using OvuSense immediately by downloading data from your sensor each morning to the OvuSense App. Your temperature is tracked in real time.

After a few days, OvuSense can predict the onset of your ovulation without having to wait until the next cycle or rely on historic data.

Three days after you ovulate, OvuSense confirms the exact ovulation date. You can also continue monitoring your progesterone levels during your luteal phase.

Real time cycle tracking app - Cycle 2
Real time cycle tracking app - Cycle 1

Cycle 2

Stop using OvuSense during your period, recommencing use immediately after it ends. OvuSense will then predict the 8 days you are most likely to conceive in this cycle.

OvuSense updates the information it provides in real time during the cycle, replacing the 8 day 'long range' window with a 'short range' 4 day ovulation window.

Scroll on the OvuSense App to compare your ovulation dates and your cycle pattern. Real time data can be shared with your partner and/or doctor through the OvuSense App.

Read about women already using OvuSense

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