Hormonal birth control methods, have multiple mechanisms for how to prevent 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 an new conceived human being to implant into the uterus.

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