After taking progesterone and stopping the drug for 3 days and still no menstruation to consider with the normal phenomenon, pregnancy, ovarian hypoplasia and so on. 1. Normal phenomenon: menstruation is due to the withdrawal of progesterone and cause the endometrium to peel and produce, progesterone is a natural progesterone preparation, stopping the drug for 3 days may not have been metabolized completely, so the endometrium is not yet peeled, so there is no menstruation yet, the general stopping the drug within 7 days of the menstruation is normal. 2. Pregnancy: for women of childbearing age with normal sex life, due to the rise in estrogen and progesterone levels in the body after pregnancy, which inhibits the growth and development of follicles, resulting in menopause, at this time, supplemental progesterone is equivalent to birth control, so there will be no menstruation after stopping the drug. 3. Ovarian hypoplasia: Because the material basis of menstrual blood is the endometrium, for women with ovarian hypoplasia, due to the low level of estrogen in the body, which leads to the thinness of the endometrium, so there may be a progesterone withdrawal after the menstrual period is still not manifested. For women who have not menstruated after taking progesterone for 3 days, it is recommended that they can observe the situation for 1 week after stopping the medication. If the menstruation is still not coming, it is recommended that they go to the gynecology department of a regular hospital to improve the blood HCG, ultrasound, and other related examinations, and then take active treatment under the guidance of the doctor after clarifying the cause of the disease.