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Does Your Temperature Drop When You Ovulate?

Understanding how your body temperature responds to ovulation is important in predicting when you’re going to be fertile each month. It’s one of the most popular methods of predicting ovulation that's available, and one that doesn’t require complicated tests or equipment like Ovulation Predictor Kits. There are drawbacks to this method however, which we will explain below, and if you want a more accurate solution that takes care of predicting and record keeping for you, then OvuSense is available.

For those not using OvuSense, we can still shed some light on that key relationship: between your temperature and your menstrual cycle.


The first thing we need to do is make clear what temperature we’re talking about. Taking your temperature at any time of day won’t give you the useful information you need here, what you’re looking for is your basal body temperature – your BBT.

BBT is the low temperature your body falls to when it’s in rest – deep in sleep. To learn your BBT you need to take your temperature as soon as you wake up – waking and beginning to be active turns up your metabolism, which heats up your body and this baseline temperature is lost. OvuSense has addressed this problem by using a vaginal sensor that records the true fluctuations of progesterone throughout your cycle and therefore giving you a more accurate reading.

Most BBT monitoring uses oral thermometers, which are usually only accurate to a tenth of a degree and can therefore miss key, subtle changes in your temperate that may have an impact on the accuracy of your ovulation prediction.

Changing Temperature

Getting the right equipment, and taking accurate temperature readings first thing every morning are all so you can spot the changes in temperature at this basal level that can signal when you’re due to ovulate.

For many women, they’ll experience a dip in body temperature the day they ovulate – it doesn’t happen for everyone, and that’s not an indicator for any health issues, it’s simply part of the diversity of the human body.

Following ovulation your core temperature rises .2 of a degree for around 72 hours. Mapping this pattern allows you to predict when you’re ovulating, and as you track it across months, you can use those temperature changes to predict when you’re going to ovulate and make sure you’re trying to conceive at those times when you have the best chance of success. One of the drawbacks of this method is that it relies on past data to predict your cycle in the future and therefore, doesn't account for those with irregular cycles that change from month to month

Once again, OvuSense has an answer to this problem. Their vaginal sensor and tracking app use up-to-date information about your cycle which notifies you 24 hours in advance of ovulation and gives a prediction that is clinically proven to be accurate 96% of the time!

Find out more about core temperature technology and fertility here