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The day you begin 'bleeding' is the first day of the menstrual. Then the days in between the next first day of bleeding is the length of the cycle, not the length of days that bleeding occurs. For instance, if you started bleeding on 1/5/08 and your next period starts on 2/1/08, you have a 28 day cycle. If you start on 1/5/08 and your necxt period starts on 2/3/08, you have a 30 day cycle. These are the most common cycles.

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Q: How do you count 28 days of mestruation cycle?
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