Contraceptive pills are divided into short-acting, long-acting and emergency contraceptive pills. Short-acting and long-acting need to be taken according to the cycle, and emergency contraceptive pills should be taken within 72 hours of contraceptive failure. 1. Short-acting contraceptives: such as drospirenone ethinyl estradiol tablets, deoxyprogesterone ethinyl estradiol tablets, etc., can be taken on the first day of menstruation, once a day, for 21 days, and then stop taking the pill for 7 days as a cycle, according to the cycle of taking. 2. Long-acting contraceptive pills: such as compound norethindrone long-acting contraceptive tablets, can be taken on the 5th day of menstruation, with an interval of 20 days and then used once, or on the 5th day of the menstrual cycle, the 10th day of the use of 1 time. Take 1 tablet each time, according to the cycle. 3. Emergency contraceptive pills: such as levonorgestrel tablets, if sexual contraception fails, can be taken within 72 hours after sex, emergency contraceptive pills are more harmful to the body, do not use as a regular contraceptive pills. When taking birth control pills, take them according to the instructions and do not use them at your own discretion.