How Do Birth Control Pills Work?
The birth control pill is a form of hormonal contraception. The pills are taken orally to prevent pregnancy, and if used properly, they are up to 99.9% effective.
A pregnancy happens when an egg released from the ovary is fertilized by a sperm, then implants itself to the uterus, where it grows into a baby. The release of eggs from the ovary is called ovulation, which is regulated by certain hormones in the woman’s body. Birth control pills prevent pregnancy by using hormones to stop ovulation.
Birth control pills contain a small amount of estrogen and progestin hormones. They work against the body’s natural cyclical hormones to prevent conception. Hormonal contraception stops ovulation. It also changes the cervical mucus pattern, making it harder for the sperm to enter the cervix to meet the egg. It alters the lining of the womb so the fertilized egg cannot implant itself.