Hormonal birth control methods have multiple mechanisms for preventing pregnancy.

According to The American College of Obstetricians and Gynecologists:

• The mucus in the cervix thickens, making it difficult for sperm to enter the uterus and fertilize an egg.
• Progestin stops ovulation, but it does not do so consistently. About 4 in 10 women who use progestin-only pills will continue to ovulate.
• Progestin thins the lining of the uterus.

Hormonal birth control pill that contains progestin also works to thin the endometrium, making it more difficult for a new conceived human being to implant into the uterus.

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