Usually after taking 1 tablet of Yutin, it can cause the menstrual cycle to be pushed back by 3-7 days, but there are some individual differences in the exact time. Yutin is an emergency contraceptive consisting of a high dose of progestin, often used within 72 hours after unprotected sex, and is a remedial form of contraception after the fact. Most women can take it after the menstrual changes, mostly manifested as early menstruation. Because yutin is a highly effective progestin, after acting on the endometrium, withdrawal bleeding can occur in 3-7 days, indicating that the contraception has been successful. However, Yuktin does not necessarily cause a delay in the menstrual cycle. If the drug does not cause withdrawal bleeding, menstruation can come on time. If it causes withdrawal bleeding and the amount of bleeding is similar to menstruation, it may cause the menstrual cycle to be delayed by half a month or even a month, or it may lead to incomplete menstruation. However, the success rate of contraception after taking Yutin is not 100%. If there is no withdrawal bleeding after taking Yutin and your period is delayed for more than 10 days, it is recommended to go to the hospital for a gynecological examination as soon as possible to exclude pregnancy.