Yutin belongs to the emergency contraceptive pill, the emergency contraceptive pill will cause changes in the body’s endocrine hormones, which may cause abnormalities in the body’s endocrine hormones, which will stimulate the endometrium and cause a small amount of bleeding, which is an adverse reaction to the drug and cause withdrawal bleeding. The bleeding will end within 3-7 days, the amount of bleeding is similar to the first day of menstruation or even just after, sometimes there may be drops of bleeding, the amount of bleeding will not be greater than the amount of menstruation, it is recommended to observe. If the bleeding time exceeds 7 days, suggesting that there will be endometrial abnormalities, it is recommended to go to the hospital registered gynecology, ultrasound to see if there are abnormalities in the endometrium, according to the situation requires the prescription of anti-inflammatory drugs and drugs to stop bleeding, to help the uterus quickly return to normal. Yutin is not 100% contraception, there is a 20% chance of failure, it is recommended to buy early pregnancy test paper for about 12 days after oral intake to rule out the possibility of conception.