Short-acting contraceptive pills are contraceptive pills taken repeatedly every month. It is divided into No.1 contraceptive pill, No.2 contraceptive pill, emergency contraceptive pill and three photos, and the methods of taking them are as follows: 1. Single-formula preparation, i.e. compounded short-acting contraceptive pills No.1 and No.2 contraceptive pills, should be taken on the first day of menstruation, and on the fifth day, one pill per day for 21 days; 2. -35 should be taken from the first day of menstruation for 22 days. It should be noted that short-acting contraceptives can only be effective in the same month.