Periods generally refer to menstruation. Taking an emergency contraceptive pill may delay menstruation, but it is impossible to generalize due to individual circumstances. Emergency contraceptive pills work by blocking the implantation of the embryo, thus providing contraception. If effective contraception is not used during intercourse, it may result in the egg and sperm combining to form a fertilized egg and an unwanted pregnancy. At this time, you can choose to take emergency contraceptive pills, as the drug contains a large amount of progesterone, which can stimulate the thickening of the uterine lining, thus effectively blocking the embryo to bed. As emergency contraceptive pills contain certain hormonal components, they will interfere with the normal menstrual cycle, leading to menstrual disorders and possible delayed menstruation. Some women may also not experience delayed menstruation and it is impossible to generalize. Even after taking emergency contraceptive pills, effective contraceptive measures should be taken and internal ejaculation should not be used to avoid unwanted pregnancy. If a woman’s period is delayed, the possibility of unwanted pregnancy cannot be ruled out. It is advisable to go to the hospital and undergo a relevant examination to determine the cause of the problem.