How to calculate the period of menstruation
Dr. Casey White
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VerifiedRestoring hope, restoring health.
2025-05-04 11:37:38
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The menstrual cycle is the interval between the first day of menstruation and the first day of the next menstrual cycle. The normal menstrual cycle is about 28 days. It is normal to advance or delay within a week. However, due to individual differences in each woman, menstrual cycles will also vary, as long as they are regular.
