What Teen Girls Should Know About Having Periods

The menstrual cycle is how a woman's body prepares for the possibility of pregnancy each month. A menstrual period is just one part of this cycle. A cycle's length is determined by counting from the first day of one period to the first day of the next period. The average menstrual cycle is 28 days long. However, a cycle can range anywhere from 23 to 35 days.
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