The lack of menstruation after taking progesterone may be a normal reaction, or it may be caused by the damage of the lining, it is recommended to observe for a period of time, in order to understand the cause of the problem and then treat the symptoms. 1. Normal reaction: generally the body has not fully recovered from the purging operation, after taking progesterone, you may need to wait for a few days before menstruation occurs, about 5-7 days, so there is no need to be overly nervous about not having menstruation. 2. Endometrial damage: If the endometrial damage is serious during the operation of the uterine cavity, and the endometrial lining is still relatively thin after taking progesterone, the absence of menstruation may also occur, and you can use medications under the guidance of the doctor, such as estradiol valerate and medroxyprogesterone acetate, etc., in order to promote the growth of the endometrial lining and regulate menstruation. In addition, the specific use of the above medications should be under the guidance of a doctor, and should not be used arbitrarily on its own.