It is possible to get pregnant after emergency contraception because its success rate is not 100%. Emergency contraception is mainly applicable to sexual life without taking contraceptive measures, usually need to be taken orally within 72 hours after sex, can achieve the contraceptive effect, usually the earlier the time to take emergency contraceptive pills, contraceptive success rate will be higher. However, the contraceptive effect of taking emergency contraceptive pills is not absolute, there may also be pregnant. Therefore, if there is a delay in menstruation after taking the emergency contraceptive pill, you need to go to a regular hospital for relevant examinations, such as blood tests or ultrasound, to determine whether you are pregnant or not, and then according to the situation to adopt the appropriate solution. If a woman does not intend to get pregnant, it is recommended that she take appropriate contraceptive measures when having sex in order to avoid unwanted pregnancy, and seek medical attention if she feels unwell.