Birth Control Pills (Oral Contraceptives).

What are birth control pills? Birth control pills (oral contraceptives) are a method of birth control that uses hormones to prevent pregnancy. The man-made female hormones in the pills change a woman's natural hormone levels and prevent her ovaries from releasing an egg each month. The cervix also produces less mucus so that sperm cannot easily enter the uterus. In addition, the lining of the uterus becomes thinner, so it would be more difficult for a fertilized egg to stay in the uterus.

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