If you want to postpone the onset of menstruation, you have to change the rule of secretion of estrogen and progesterone by the ovaries of women, the methods of postponing menstruation are as follows: 1. Use progestin-like drugs, if you start taking progestin-like drugs before the onset of menstruation, such as progesterone capsules and dihydrogesterone tablets, you will keep the progesterone level in your body in a high state, so that the endometrium continues to be in the secretory phase without The progesterone level in the body will be maintained at a high level, so that the endometrium will continue to be in the secretory phase without exfoliation, and naturally there will be no menstruation. When the progesterone level in the body decreases after stopping the use of progesterone, the endometrium will be stripped and bleeding will occur and the onset of menstruation will be delayed. 2. Use of short-acting contraceptives, taking short-acting contraceptives orally before the onset of menstruation, can also change the state of the endometrium, so that the endometrium will delay entering the secretory phase or remain in the secretory phase and cannot be stripped on time, thus delaying menstruation. 3. Estrogen, taking estrogenic drugs has the effect of If estrogen is taken before the onset of menstruation, it will easily lead to disruption of the ovarian secretion of estrogen and progesterone, so it is not recommended.