The two different kinds of emergency contraceptive pills (ECPs) have a slightly different effectiveness: The progestin-only kind is about 90% effective and the combined estrogen-progestin pills (ECPs) are about 75% effective. About 10% of women become pregnant after unprotected intercourse. Only one (instead of 10) woman would get pregnant if she takes the progestin-only pills, while only about two (instead of 10) women who take ECPs would get pregnant.

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