If the emergency contraceptive pill interferes with the formation of a fertilized egg, the pregnancy will not continue. If the pregnancy is clear and a gestational sac is observed by ultrasound, the survival of the fetus is not affected by the pill. Although the emergency contraceptive pill does not directly act as an abortion, it can have adverse effects on the fetus and the health of the pregnant woman. Adverse effects 1. on the fetus: Since the main component of the emergency contraceptive pill is a large dose of progestin, it will generally not cause adverse effects on the fetus in the early stage of pregnancy, but during the critical period of the development of the fetal reproductive system, if a large dose of the emergency contraceptive pill is taken, it may affect the development of the fetal reproductive system; 2. on the pregnant woman: the progestin in the emergency contraceptive pill will also cause discomfort symptoms in the pregnant woman herself, and generally After taking it, there will be obvious gastrointestinal reactions, such as nausea, vomiting, abdominal pain, etc. Precautions 1, emergency contraceptive pill contraceptive efficiency is lower than conventional contraceptive methods, and emergency contraceptive pill hormone dose, side effects, can not replace conventional contraception, not often taken; 2, taking emergency contraceptive pill is best within 72 hours after sex, the earlier the effect is better, more than 72 hours failure rate is higher; 3, patients with liver disease, kidney disease, hypertension, diabetes and other diseases are not suitable for taking emergency Contraceptive pills.