If you take the pill during menstruation, it will cause a significant reduction in the amount of menstruation and allow the endometrium to repair as quickly as possible. This is because short-acting contraceptives are a combination of estrogen and progestin, which have the effect of repairing the endometrium of the uterus. In clinical practice, if used to regulate menstruation or for contraception, it is taken orally on the fifth day of menstruation, which basically has little effect on menstruation. Take one tablet once a day for 21 days to prevent pregnancy for one month. If you want to continue taking the pill next month, you must start taking it again on the fifth day of your menstruation. It is also recommended that you must take vitamin C and vitamin E supplements when taking the oral contraceptive pill, because taking the pill for a long time may cause roughness, dullness, or the appearance of discoloration of the skin. Oral vitamin C and vitamin E can reduce the appearance of symptoms.