Understanding Your Menstrual Cycle

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The four phases, in short

A menstrual cycle is usually described in four phases: menstrual, follicular, ovulation and luteal. Each phase is driven by a different balance of hormones, which is also why symptoms can shift so much across a single cycle.

Why "28 days" is only an average

Cycle length varies widely between people, and can vary cycle to cycle for the same person. Tracking your own data over a few months is a more useful reference point than any single textbook number.

What to log

• Start and end dates of your period
• Flow intensity
• Symptoms and mood
• Anything unusual for you

When to talk to a doctor instead of an app

If your cycle changes suddenly, periods stop for reasons other than pregnancy, or you have severe pain, that's a conversation for a clinician — see the Medical Disclaimer for more on what the app can and can't tell you.