Yohtek is an emergency contraceptive, also known as the morning-after pill. It is only effective for sexual intercourse that occurs before taking the pill, and is not effective for sexual intercourse that occurs again after taking the pill. If you have sex again after taking Yutin, and you don’t want to get pregnant, you will have to take the emergency contraceptive pill again. Because the emergency contraceptive pill contains a large dose of progesterone, taking the emergency contraceptive pill once in a while will not cause significant adverse effects on the endocrine function of the ovaries. If emergency contraceptive pills are taken frequently within a short period of time, it will affect the regularity of the ovarian secretion of estrogen and progesterone, leading to endocrine dysfunction of the ovaries and disruption of menstruation. In principle, the interval between two doses of emergency contraceptive pills should be at least three months, and in the absence of preparation for pregnancy, safe and effective measures for contraception should be taken during sexual intercourse.