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Your period is the last part of your monthly cycle. Stage 1 has your body building up blood-rich cells, preparing for pregnancy. Stage 2 is ovulation. Stage 3 is the shedding of the blood-rich membrane, also known as your period. Stage 4 is the length of time of your period, which is usually 3-7 days. Then it starts all over again (unless you get pregnant).

Most girls and women find that periods last for about 5-7 days, and that they get their period approximately once a month. After a couple of years of having your period, your body will settle into a pattern that’s unique to you, and you'll be familiar with how many days of bleeding to expect. If you notice that you don’t get your period very often, or if it lasts for longer than 7 days, it might be a good idea to check in with your doctor.