By Libby Callahan and Emmi Albert TB: 2
How does the pill work?
They contain a combination of the hormones estrogen and progesterone to prevent ovulation (the release of an egg during the monthly cycle). A woman doesn't get pregnant if there is no egg to fertilize. Also makes the mucus around the cervix thicker so the sperm has a hard time entering.
How well does the pill work?
The usefulness of the pill depends on whether or not you take your pills daily. Only 8 out of 100 people who rely on the pill get pregnant. Missing even 1 day increases your chance of getting pregnant. Also depends on other things such as health conditions and other medications or herbal supplements that might interfere with the use.