Progesterone drugs can promote the onset of menstruation, but the effect is not so fast, it is not possible to get a period immediately after taking them. Progesterone drugs are progesterone drugs that promote the thickening of the endometrium. The normal thickness of the endometrium is greater than 0.8cm to have normal menstruation, and too thin an endometrium can affect normal menstruation. Before taking progesterone drugs, you can go to the hospital to test the thickness of the endometrium and determine whether you need to take progesterone drugs according to the specific circumstances of the test. If you do not have a period after taking progesterone drugs for more than 10 days, you need to go to the hospital to test the value of human chorionic gonadotropin to determine whether there is pregnancy. If you have regular irregular periods, you will need to have your female hormones tested to find the cause and treat the problem.