The emergency contraceptive pill is an after-the-fact pill, mainly due to the remedy afterwards when no contraceptive measures are taken during intercourse. However, the emergency contraceptive pill is composed of large doses of progestin, and its side effects are particularly strong, so it is generally recommended that the number of emergency contraceptive pills should not exceed three times a year, so you can take the emergency contraceptive pill once every four months. If the emergency contraceptive pill is taken more than three times a year in a row at particularly short intervals, it will often cause irregular vaginal bleeding. It may also affect the endocrine function of the ovaries leading to menstrual disorders and may even cause secondary infertility, so the emergency contraceptive pill cannot be used as a regular form of contraception.