Health Library

Irregular Cycles & Conditions

Evidence-informed guides about periods, ovulation, fertility and women's health.

4 articles

Why Your Predicted Ovulation Date Keeps Changing

Your predicted ovulation date can move when your cycle changes. Learn why ovulation predictions shift and how to improve the information your app uses.

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025 min read

Missed Period but Not Pregnant: Common Causes

A missed period does not always mean pregnancy. Learn common causes of a late or missed period and when it is worth speaking with a healthcare professional.

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035 min read

What Is Anovulation? Can You Have a Period Without Ovulating?

Learn what anovulation means, why it can happen, whether bleeding can occur without ovulation and how anovulation can affect fertility and cycle tracking.

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045 min read

Irregular Periods: Causes and When to Get Help

Irregular periods can happen for many reasons, from stress and weight changes to PCOS and thyroid problems. Learn when to track, wait or seek medical advice.

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