The normal menstrual cycle is about 28 days. Do not artificially change your menstrual cycle without special circumstances, and try not to use medicine to postpone your menstruation. If you need to postpone your period because of some special circumstances, you can postpone your period by the following methods: 1. Use progestogen drugs, you can start taking progesterone capsules or progesterone tablets a few days before your period, and keep taking them until you stop when you want to have your period, usually three to seven days after you stop taking them. 2. Take short-acting oral contraceptives, you can start taking short-acting contraceptives on the fifth day of your period. Take short-acting contraceptive pills, take them every day on time, and stop taking them until you want to have your period, and you may have your period 3-7 days after you stop taking them.