The average age to start is 12 but most people’s periods start between 8 and 17. Every month, the ovaries release an egg – this is called ovulation. If this egg is not fertilised by a sperm, it is shed through the vagina along with the lining of the womb, and this is what period blood is. A period will usually last for three to eight days. A menstrual cycle starts on the day that you get...
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