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Menstrual cycle: What's normal, what's not

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Do you know when your last menstrual period began or how long it lasted? If not, it might be time to start paying attention.

Tracking your menstrual cycles can help you understand what's normal for you, time ovulation and identify important changes — such as a missed period or unpredictable menstrual bleeding. While menstrual cycle irregularities usually aren't serious, sometimes they can signal health problems.

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