Understand the female menstrual cycle, ovulation and periods

A woman's menstrual cycle is the number of days from the day she starts bleeding until the day before her next period starts, approximately 28 days. However this varies from cycle to cycle. In fact, 46% of menstrual cycles vary by seven or more days. Learn more about your cycle & put your knowledge to the test in our fertility quiz.
You probably already know quite a lot about your menstrual cycle – like how often you get your periods and how heavy they are.

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