Question

menstruation occurs ones in about​

Answer 1

Answer:

The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 31 days in adults. The average length is 28 days; one study estimated it at 29.3 days.

Answer 2

Answer:

Problems with your period?

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What’s the menstrual cycle?

Your menstrual cycle helps your body prepare for pregnancy every month. It also makes you have a period if you’re not pregnant. Your menstrual cycle and period are controlled by hormones like estrogen and progesterone. Here’s how it all goes down:

You have 2 ovaries, and each one holds a bunch of eggs. The eggs are super tiny — too small to see with the naked eye.