Science-backed guides on periods, ovulation, PMS, and everything your body does
New articles every week
A period is considered late after 5 days past your expected date. Stress, weight changes, PCOS, thyroid issues, and 6 other science-backed reasons your cycle may be off — and exactly when to see a doctor.
Bloating, breast tenderness, mood swings, fatigue — your body gives you clear signals 1–2 weeks before your period. Learn all 15 signs and how to track them.
Four proven methods — from basal body temperature to cervical mucus — to accurately identify your fertile window and ovulation day every cycle.
A 2-day delay is almost always nothing to worry about. Learn the 8 most common causes, what symptoms to watch for, and exactly when to take a pregnancy test.
A normal period lasts 2–7 days, but what's normal for you matters most. Learn what very short or long periods mean, why your period length changes, and when to see a doctor.