Jin Yuting is an emergency contraceptive pill with progestin as the main ingredient, the contraceptive rate is not 100% after taking it, there is a 2%-4% chance of unwanted pregnancy. And after taking the Jin Yuting is particularly susceptible to ectopic pregnancy, such as tubal pregnancy. The reasons for contraceptive failure after a woman takes Jin Yuting are mainly considered in the following three aspects: first, the patient took Jin Yuting after nausea, vomiting, resulting in part of the drug was vomited, so it affects the effectiveness of the drug. If a woman has nausea and vomiting within an hour after taking Kim Yoh Ting, she needs to take a refill. Second, the patient has gastrointestinal diseases, resulting in poor absorption caused by the relative insufficiency of Yuk-Tin after the patient takes Yuk-Tin, so there is a contraceptive failure. Third, because the patient is relatively fat, weight is relatively large, so after taking Yutin, resulting in the patient’s relative insufficiency of the drug, so there is a contraceptive failure.