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The menstruation cycle happens once a month every 27-30 days. Tiny cells that get fertilized when you are pregnant, come out of your body in a blood like form because when they enter your uterus they collect a lot of blood and then leave the body. This occurs because the body produces eggs so you can get pregnant, but when they are not being used they leave the body, therefore you get your period once a month. Some girls can get their period from age 9-18. Side-effects include; bloating, cramps, fatigue, vomitting, and others.
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