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Having a period (menstruation) is a normal, healthy part of being a woman. It’s also part of the menstrual cycle, a process that makes it possible for women to become pregnant.
It’s possible, though rare, for a woman to become pregnant during her period—especially if she has irregular cycles.
Eggs are female reproductive cells stored in the ovaries. During each cycle, one egg matures and is released from an ovary. This is called ovulation. The egg then travels from the ovary to a fallopian tube.
The egg moves through the fallopian tube toward the uterus. If sperm are present in the tube, the egg may be fertilized, resulting in pregnancy.
The lining of the uterus is made up of blood, tissue, and fluid. During each cycle, the lining thickens. This helps prepare the uterus to receive and nourish a fertilized egg.
If pregnancy doesn’t occur, the egg and thickened lining of the uterus are no longer needed. They are then shed through the vagina. This is called a period.
It is normal for a cycle to take 20 to 36 days. For teenagers, the time between periods might be more or less. For adults, it will be around a month from the first day of one period to the first day of the next. That’s why you may hear women talk about a “monthly cycle.”
It’s normal for a period to last 2 to 8 days. Talk to your doctor if your period lasts longer than 8 days for 2 cycles in a row.