Ovulation FAQ

Common questions about ovulation, fertility, and cycle tracking.

When does ovulation occur?

Ovulation typically occurs about 14 days before your next period starts. For a 28-day cycle, that's around day 14. For a 30-day cycle, it's around day 16. The luteal phase (ovulation to period) is relatively consistent at 12-16 days, while the follicular phase (period to ovulation) varies more.

How long does ovulation last?

Ovulation itself — the release of an egg from the ovary — happens within minutes. However, the egg remains viable for 12-24 hours after release. Combined with sperm survival of up to 5 days, the total fertile window spans about 6 days per cycle.

What are signs of ovulation?

Common signs include changes in cervical mucus (becomes clear and stretchy, like egg whites), a slight rise in basal body temperature (0.2-0.5°F after ovulation), mild pelvic pain (mittelschmerz), increased libido, and breast tenderness. Not everyone experiences noticeable symptoms.

Can stress affect ovulation?

Yes. Physical or emotional stress can delay or prevent ovulation by disrupting the hormonal signals that trigger egg release. This is one reason why calendar-based predictions can be off — your body's ovulation timing responds to your overall health and stress levels.

What is anovulation?

Anovulation is a cycle where no egg is released. It can occur occasionally in otherwise regular cycles or be a chronic issue. Common causes include polycystic ovary syndrome (PCOS), thyroid disorders, excessive exercise, extreme weight changes, and high stress. If you regularly miss periods or have very irregular cycles, speak with your healthcare provider.

Do ovulation predictor kits (OPKs) work?

OPKs detect the surge in luteinizing hormone (LH) that occurs 24-36 hours before ovulation. They're more accurate than calendar methods alone because they respond to your body's actual hormonal signals rather than predictions. They work best when combined with an estimated ovulation window so you know when to start testing.

Is basal body temperature (BBT) tracking accurate?

BBT tracking can confirm that ovulation occurred but can't predict it in advance. Your temperature rises 0.2-0.5°F after ovulation and stays elevated until your next period. Because the rise happens after the egg is released, BBT is most useful for identifying patterns over multiple cycles.

How does age affect ovulation?

Ovulation becomes less regular and less frequent as you approach perimenopause, typically in your late 30s to 40s. Egg quality also declines with age. However, individual variation is significant — some people maintain regular ovulation into their early 40s while others experience changes earlier.