After taking Yuktin there is no withdrawal bleeding, clinically mainly because in the second half of the menstrual period to take Yuktin, in the second half of the menstrual period, after ovulation ovarian corpus luteum formation, the endometrium in the role of the corpus luteum will appear thickened. After Yutin is taken orally, although Yutin is a highly effective progestin that thickens the endometrium, the progestin in the body is already sufficient to support the endometrium, so vaginal bleeding will not occur even when Yutin is stopped, but it does not indicate contraceptive failure, so it is recommended to wait patiently. If it is when you want to get your period, you have not yet gotten your period, and then test by early pregnancy test to rule out the possibility of pregnancy, because the contraceptive effect of yutin in clinical practice is not 100%.