A period is a release of blood from a girl's uterusout through her vagina. It is a sign that she is getting close to the end of puberty. There is a lot to learn about periods.
The menstrual cycle is the series of changes a woman's body goes through to prepare for a possible pregnancy.
Starting your menstrual period is one of these changes. When puberty begins, your brain signals your body to produce hormones. Some of these hormones prepare your body each month for a possible pregnancy. This is called the menstrual cycle.
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