1.Short-acting oral contraceptives generally start from the first day of the normal menstrual cycle (i.e., the day of coming to menstruation), take 1 tablet every day for 21 days, and usually stop taking the pill for 1-4 days to get a period. Repeat the above method 7 days after stopping the medication and start a new round of medication, without interruption. 2. If there is still no menstruation for more than 2 months in a row, you should go to hospital to check the cause of menopause; 3. If you miss a dose, take 1 tablet immediately on the 2nd day to avoid contraceptive failure or breakthrough bleeding; 4. The medicine should be put in a dry place so that the sugar coating of the tablet does not damp out or fall off, causing insufficient amount of medicine to affect the contraceptive requirement.