What is ovulation?
Ovulation is the release of an egg from the ovary, roughly the midpoint of your menstrual cycle. It marks the peak of estrogen and the switch from the follicular phase to the luteal phase. It typically happens about 12 to 16 days before your next period starts, so in a textbook 28-day cycle that is around day 14, but the exact day varies a lot between women and from cycle to cycle. See the four cycle phases.
The most common signs of ovulation
- Cervical mucus changes. The clearest natural sign: discharge becomes clear, stretchy, and slippery, like raw egg white, in the day or two before ovulation.
- A small temperature rise. Basal body temperature ticks up by around 0.3C after ovulation, as progesterone rises. It confirms ovulation has happened rather than predicting it.
- A mid-cycle twinge. Some women feel a brief one-sided ache, known as mittelschmerz, around the time of release.
- A shift in libido and energy. Many women notice higher energy, drive, and a sense of feeling at their best around ovulation.
When does ovulation occur in your cycle?
The reliable rule is that ovulation happens about 12 to 16 days before your next period, not a fixed number of days after your last one. That is why counting forward from your period is unreliable, especially if your cycles vary in length. The follicular phase before ovulation is the part that stretches or shortens, while the luteal phase after it stays fairly constant. See irregular periods.
Why ovulation matters for training
Around ovulation, peak estrogen means many women feel their strongest, so it is a natural window for hard running and heavy lifting. Higher estrogen is also linked with slightly greater joint laxity for some, so warm up well. After ovulation, rising progesterone raises your resting effort and temperature, which is why the same session can feel harder a week later. See follicular phase training.
A note on what tracking can and cannot do: ovulation signs and app predictions are estimates of a pattern, not a precise guarantee, and they are not reliable as contraception or, on their own, for timing conception. For those, use a method built for the purpose. Phaes is informational, not medical advice.
How Phaes helps
Phaes anchors to the cycle starts you log and projects your phases on demand, so it knows roughly where your ovulation window falls even when your cycle length changes, and it biases quality work toward the strong days while reading your daily check-in for the final say. See how to track your cycle and cycle syncing workouts.