There are short-acting oral contraceptives and emergency contraceptives. The main component of short-acting oral contraceptives is the combination of highly effective progestin and estrogen, which will cause withdrawal bleeding after 3-7 days when the pill is stopped after 21 days. This is due to the withdrawal of estrogen and progesterone from the endometrium, without the support of hormones, so vaginal bleeding will occur, also called menstruation, which is a normal phenomenon. In case of oral emergency contraceptive pill, this drug is a simple and highly effective progestin, which can change the normal endocrine state after eating and can inhibit ovulation. After stopping the pill, there will be a withdrawal of progesterone, so there will be withdrawal bleeding, if the bleeding volume is close to the amount of menstruation, then it means that the contraception is successful.