Emergency contraception is a type of emergency birth control method used to prevent pregnancy in a woman who has had unprotected sex or whose birth control method has failed like having a condom break or slip off or has forgotten to take her regular contraceptive pill.
If a hundred women each had sex once during the second or third week of menstrual cycle, without using contraception, eight would likely become pregnant. Only few of these hundred women using emergency contraception would likely become pregnant.
