After taking Yuktin lead to delayed menstruation, usually in about a week, a few women may also make menstruation early, mainly with the women taking the drug in the menstrual cycle has a relationship. Yutin is an emergency contraceptive pill, if taking Yutin happens to be in the pre-ovulatory period, resulting in delayed ovulation of the ovaries, the body’s progesterone levels rise for a long time, so that the endometrium continues to grow, women’s menstruation will be delayed. If a woman taking Yutin is in the late ovulation of the follicle, which is the second half of the menstrual cycle, the endometrium responds significantly to the elevated progesterone level, and the endometrium peels off after stopping Yutin, and menstruation will come early. Occasional use of Yutin can, but often take easily lead to menstrual disorders, is not conducive to women’s health, may also lead to contraceptive failure.