A woman had unprotected intercourse 36 hours ago and is concerned that she may become pregnant because it is her "fertile" time.She asks the nurse about emergency contraception.The nurse tells her that:

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To minimize the side effect of nausea that occurs with high doses of estrogen and progestin,the woman can take an over-the-counter antiemetic 1 hour before each dose.Emergency contraception is used within 72 hours of unprotected intercourse to prevent pregnancy.Postcoital contraceptive use is 74% to 90% effective at preventing pregnancy.Oral emergency contraceptive regimens may include progestin-only and estrogen-progestin pills.Women with contraindications to estrogen use should use progestin-only pills.

A Woman Had Unprotected Intercourse 36 Hours Ago and Is