Bleeding a week after taking the emergency contraceptive pill is not necessarily a period, but in most cases is a sign of withdrawal bleeding. The emergency contraceptive pill is usually a high-dose progestin or anti-progestin preparation that replaces endogenous hormones and supports the endometrium during the pill, and when the progestin withdraws after stopping the pill, the endometrium is not supported, which can cause bleeding, often about a week after stopping the pill, called withdrawal bleeding. Retreat bleeding is not part of normal menstruation, but the amount and nature of the bleeding is similar to the usual menstruation, so it can be counted as a menstruation, and the time of menstruation will be based on this. However, if the vaginal bleeding is minimal, it cannot be ruled out as a contraceptive failure and some women may experience bleeding when the fertilized egg is in the womb. The emergency contraceptive pill can prevent 75-85% of unwanted pregnancies, but there is still a small percentage of women who will have a contraceptive failure, so if necessary, go to the hospital for an examination to rule out the possibility of an unwanted pregnancy. There are requirements for when and how many times to take the emergency contraceptive pill, and factors such as missed or late doses and drug failure can cause contraceptive failure, and the emergency contraceptive pill should not be taken more than three times in a year to avoid effects on the body. Therefore, women who do not intend to get pregnant are advised to use condoms during intercourse.