The reason for taking diethylstilbestrol after ovulation may be because of insufficient progesterone found through sex hormone six test, or there are corresponding clinical symptoms of insufficient progesterone, such as shortened menstrual cycle, less than 25 days or irregular vaginal bleeding in the second half of menstruation, which may be caused by insufficient progesterone. The purpose of taking diethylstilbestrol orally to replenish progesterone after ovulation is to 1) restore the menstrual cycle to normal and reduce the bleeding in the second half of menstruation. normal and reduce bleeding in the second half of menstruation.2. In clinical practice, supplementation of progesterone will also improve the chances of pregnancy, and because dydrogesterone is a prescription drug, it should only be used under the guidance of a doctor. In the process of taking dydrogesterone tablets can not be taken intermittently, once the situation of missing the dose may not achieve the therapeutic effect, may lead to irregular vaginal bleeding.