Prolonged periods after taking the emergency contraceptive pill is a common side effect of the emergency contraceptive pill, and there is no need to worry about it, and it can be adjusted by taking progesterone and other drugs under the guidance of a doctor. However, this situation can not exclude the possibility of abnormal bleeding after contraceptive failure, pay attention to close observation. 1, drug side effects: the main component of the emergency contraceptive pill is levonorgestrel, which contains a large amount of progesterone, 10 times more than ordinary contraceptives, after oral intake will prevent ovulation of the ovaries, by breaking the normal ovulation pattern to play a contraceptive role. However, it can lead to endocrine disorders, menstrual cycle disorders and other problems, which in turn lead to prolonged periods and increased bleeding. If the period is too long, more than 7 days, progesterone can be taken under the guidance of a doctor, and the menstrual cycle can be adjusted after 2-3 menstrual cycles. If the excessive amount of menstrual blood causes discomfort, you can also take oral hemostatic pills to stop bleeding after consulting your doctor; 2. Contraceptive failure: If the pill is ineffective and the fertilized egg successfully implants, there may be abnormal vaginal bleeding or vaginal bleeding from ectopic pregnancy. The emergency contraceptive pill is an aftercare pill and does not directly confirm the success of contraception. After taking the pill, pay attention to continue the regular contraceptive measures and perform pregnancy tests, such as blood HCG measurement and ultrasound, to rule out contraceptive failure. Emergency contraceptive pills have major side effects and it is not recommended to take them more than four times in a year to avoid more serious effects on a woman’s body, such as uterine fibroids and infertility. For women who do not need to have children, try to use condoms and non-emergency contraceptive pills for contraception.