The main clinical method to delay menstruation is the application of drugs, which inhibit the function of the ovaries, prevent the production of follicles and inhibit the discharge of follicles, so that the ovaries are unable to produce eggs and the sperm and eggs cannot unite to form a fertilized egg, thus achieving the role of contraception. The most commonly used contraceptive is the pill, which can inhibit the function of the ovaries, but the method and time of taking it should be mastered, and try not to miss a dose in the middle. If you miss a dose of oral medication, you may experience irregular vaginal bleeding in small amounts, which also affects the effect. Stop the drug when you want to have your period, and you will have a normal period after 3-7 days of stopping the drug. However, in this case, it is anovulatory menstruation, which is only a period formed by the peeling off of the lining formed after the hormone withdrawal.