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I want to know about complete details of menstrual cycle. What is 1st day means. When does bleeding happens. When to have safe sex.
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Dear lybrate user. I do understand. Menstruation is a cycle. The first day is the day in which bleeding is seen. Bleeding happens because of the disintegration of unfertilized egg. Safe sex can be up to 10 days from fday 1 and before 7 days of the next day 1. I suggest you read many articles available online. Take care.
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