OvuSense logo

Understanding cycle characteristics

We now know from other literature only a small percentage of women ovulate exactly 14 days before the onset of menses. Baird et al. (1995) - study size 221, Lenton et al. (1984 a & b) - study sizes 327 and 293 cycles, respectively. This being the case even for women who usually experience a 28 day cycle length. In addition, as Wilcox et al. (2000) – study size 221 demonstrated, the fertile window falls entirely between cycle days 10 and 17 in only about 30% of women. Most women reach their fertile window earlier and some much later. This 'norm' continues to become less common as couples attempt to conceive later in life. So, earlier or later ovulation in a cycle is not necessarily a concern - but knowing when ovulation occurs is extremely important to maximise the chances of conception
Early Ovulation

Early Ovulation

Wilcox et al. (2000) estimated that 2% of women were in their fertile window by the fourth day of their cycle and 17% by the seventh day (based on 213 women).
Late Ovulation

Late Ovulation

An estimated 30% of OvuSense users have late ovulation - that is, an ovulation which occurs more than 65% of the way through a cycle. This estimate appears to be consistent with the findings of Wilcox et al. (2000) This pattern of a shortened follicular phase is more frequently identified in older women due to earlier dominant follicle selection - Klein et al. (2002) - study size 31 , and also correlates with a history of recurrent miscarriage - Jukic et al. (2007) - study size 201
Slow Rise

Slow Rise

A slow rise occurs in an estimated 5% of OvuSense users, and is characterised by a slow and steady increase in temperature over a number of days, rather than a steep rise over two to three days. A slow rise is generally related to Polycystic Ovarian Syndrome and/ or an indication of Polycystic Ovaries. However, it can also be a sign of Diminished Ovarian Reserve. A recurrent slow rise over 3 or more cycles without a previous diagnosis of either of these ovulatory issues would indicate the need for a formal diagnosis.
Short Luteal Phase

Short Luteal Phase

A short luteal phase is deemed to be any ovulation that occurs 10 days or less before a subsequent onset of menstruation. This situation can occur with Polycystic Ovarian Syndrome but is not limited to that ovulatory issue alone. Short luteal phases are commonly seen at the extremes of reproductive life, at times of stress or due to other conditions such as thyroid disorders and stress. A short luteal phase in 2 or more cycles out of 3 would indicate a necessary treatment as women with a tendency to short luteal phase have a higher chance of miscarriage.

OvuSense, for your whole fertility journey

Unlike other products, OvuSense uses data from the current cycle to predict ovulation in real time and then confirm the exact date of ovulation with 99% accuracy. It then predicts your fertile window, and helps you and your physician to track your whole cycle, enabling diagnosis of ovulatory issues and monitoring of medication.

Click on the "i" icon next to each method in the table, or directly on the method in the table on mobile devices to find out more about the clinical evidence.

  Fertile Window Ovulation Clinical
Previous cycle data
(Core Body Temperature)
Fertility Tracker Apps FTA
Basal Body
Skin Worn Devices SWD
Fertility Bracelet Devices FBD
Ovulation Predictor
Kits (urine strips)
Ovulation Predictor
Monitors (urine strips)
Serum Progesterone SP
Ultrasound US