The effect of emergency contraceptive pills on the fetus needs to be analyzed in different situations. If an accidental pregnancy is found after taking the emergency contraceptive pills, it may not affect the fetus, or it may affect the fetus, leading to developmental malformations and spontaneous abortion; if the emergency contraceptive pills are still taken after a clear pregnancy, it may cause abnormal fetal estrogen levels and affect fetal organ differentiation, leading to gender disorders in the fetus. Therefore, it can be judged by improving the relevant examination under the guidance of doctors: 1. Accidental pregnancy after taking the pill: if the pill is taken within 4 weeks of menopause, the effect on the fetus is divided into two cases, that is, either the pill has no effect on the fetus, or the fetus is affected by the pill leading to developmental malformation, resulting in spontaneous abortion; 2. Taking the pill after pregnancy: emergency contraceptives are hormonal drugs, and taking them after pregnancy can cause abnormal fetal estrogen levels, such as female masculinization or male feminization. This situation can be determined after pregnancy through malformation screening, to determine the normal fetus can continue the pregnancy, but also need to regularly pregnancy test, found in the case of abnormalities early termination of pregnancy. In conclusion, if pregnancy is confirmed, medication during pregnancy should be avoided as it may cause malformations in the fetus and lead to adverse consequences. For women who are not sure whether they are pregnant or not, if they do not have a plan to prepare for pregnancy, they should take safe and effective contraceptive measures such as condoms and birth control rings when having sex, and minimize the use of contraceptive pills, which can reduce the impact on the woman herself or on the fetus after an unplanned pregnancy.