Ovulation when you have PMOS

Polycystic ovary syndrome — renamed polyendocrine metabolic ovarian syndrome, or PMOS, by global consensus in 2026 — affects, on the World Health Organization’s figures, an estimated 10–13% of women of reproductive age, and it works directly against the signal temperature tracking depends on. Cycles run long or arrive unannounced, some pass without releasing an egg at all, and when ovulation does happen the progesterone rise behind it can be blunted. That makes it a demanding setting for any ovulation feature, and one worth measuring rather than assuming.

Checked against ovulation-test peaks that members logged themselves in the app, detection landed within two days of the expected point in 74.5% of cycles. The detected day sits about 1.7 days after the logged hormone peak, which is the expected physiological lag rather than an error: the hormone surge precedes ovulation by roughly a day.

Against women who reported no condition at all, the detected day sits 0.37 days further from the expected point on average — 2.7 days against 2.3. That suggests only a small difference in PMOS.