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This video reviews the stages of the menstrual cycle and talks about how it can vary in terms of how long it lasts and how often it occurs, especially when girls first get their periods - which is totally normal. It talks about how the fertile period is not always in the middle of a cycle, and that cycles vary from 21 to 50 days (or even shorter or longer) versus the 28-day cycle that is often talked about.
Variations in the Menstrual Cycle: Get to know your cycle