There are many types of contraceptive pills, including short-acting pills, long-acting pills and emergency pills. If you take short-acting contraceptive pills and insist on taking them regularly, it usually will not lead to a change in the regularity of menstruation, as long as you insist on taking them regularly, at regular intervals and in the right amount. The short-acting pill is a regular 28-day cycle. If you take the short-acting pill but have an early or wrong period, you may have missed or taken too much in the middle. The hormonal content of the emergency contraceptive pill is relatively high, and many people may experience changes in their hormone levels after taking the pill, which may affect the accuracy of the menstrual period. There are other medications, such as taking psychotropic drugs, and if combined with birth control pills, the interaction of the two drugs can also lead to changes in the menstrual cycle. Therefore, it is impossible to determine whether taking birth control pills will affect the delay of menstruation, and it must depend on which one is taken and whether the method of taking it is appropriate and correct in order to systematically assess whether birth control pills will affect menstruation.