Taking birth control pills generally postpones menstruation for 7-14 days at most, depending on the individual’s physical condition, diet and daily routine, the postponement time is not the same, and there are a few people who will delay for more than half a month. Although the rate of contraceptive pills is quite high nowadays, it is not 100% effective. If you are not taking the pill on a regular basis, the effect is generally not great. If there is no menstruation after more than 10 days of delay, it should be considered a contraceptive failure and an early pregnancy test should be done early to rule out the possibility of pregnancy. It is a hormonal drug, regular use will lead to endocrine disorders in the body, menstrual disorders, it is recommended not to use as much as possible.