Answer:
A period happens because of changes in hormones in the body. Hormones are chemical messengers. The ovaries release the female hormones estrogen and progesterone. it usually takes about a month for the lining to build up, then break down. that is why most girls and women get their period around once a month. its really helpful if girls learn to start observing their menstrual cycle, so they can start to predict fairly accurately when they will get a period and can be ready with a pad or cloth in their school bag.
