Cycle × body · 6 min
How to recognise ovulation: three signals that actually work
Apps that predict ovulation from average cycle length hit the fertile window in roughly half of cases. Your own body is more accurate — but you need to know what to look for.
1. Cervical mucus (the earliest signal)
2–5 days before ovulation, EWCM (egg-white cervical mucus) appears: clear, stretches 5–10 cm between fingers, like raw egg white. It's the single best indicator of approaching ovulation. After ovulation it disappears abruptly, replaced by creamy thicker mucus or dry days.
Check just by observing underwear or mucus when urinating. No internal exam needed.
2. Basal body temperature (confirms after the fact)
Right after ovulation, progesterone raises body temperature by 0.2–0.5°C. Measure in the morning before getting out of bed, always at the same time. After a few cycles a biphasic chart appears: lower temps in the first half, higher in the second, with a clear jump between phases.
Downside: temperature tells you about ovulation 24–36 hours after, not before. Upside: it confirms ovulation actually happened. Together with mucus it gives a reliable picture.
3. Ovulation pain (in some people)
20–40% of menstruating people feel brief pain on one side of the lower abdomen near ovulation. Lasts minutes to 48 hours. The side can switch between cycles. Combined with EWCM, it's an almost certain signal that ovulation happened that cycle.
Less reliable signals
- Libido spike — often true, but depends on many things beyond hormones.
- Breast tenderness — appears more in the luteal phase (after ovulation), not around it.
- Ovulatory spotting — occurs in 3–5% of cycles, not the rule.
- Apps based on average cycle length — they guess, they don't observe.
Pharmacy tests
Ovulation predictor kits detect LH surge in urine, preceding ovulation by 12–36 hours. Accurate but expensive with regular use and don't replace observing your own body. Make sense when timing is critical (trying to conceive) or the cycle is atypical. In perimenopause they can mislead — LH spikes can be fluctuations, not ovulation.
What this gets you daily
Knowing which cycle day you're in — without guessing. A real picture of whether ovulation actually happened or not. The ability to link state (energy, mood, libido) with cycle phase, so "hard for no reason" days stop being for no reason.