Yutin is an emergency contraceptive drug. Because each person’s constitution is different, there may be early menstruation and delayed menstruation. If there is a delay in menstruation, it is usually delayed for 7-10 days before menstruation. However, in some cases, the delay may be longer due to endocrine hormonal disturbances caused by the emergency contraception. But when there is a longer delay, it is important to rule out the chance of pregnancy. It is not a 100% contraceptive, and there is a 20% chance of failure. This time, in the case of ruling out the absence of pregnancy, you can observe about 7-12 days. If more than 12 days have not come, this time go to the hospital to do an ultrasound to see the thickness of the endometrium, before you can decide whether to take oral menstrual drugs to help promote menstruation.