When menstruation does not come, you can take some oral progestins, such as progesterone and dextroprogesterone tablets, to rapidly grow the uterine lining, and achieve a purpose of promoting menstruation. However, before taking these medications, an ultrasound should be performed to determine the thickness of the uterine lining before deciding to take them orally. If the thickness of the uterine lining itself is about 1.2 centimeters, wait for a few days as long as possible to have your period, because these progestins, if not stopped during oral intake, may keep causing the growth of the uterine lining, which will always cause a delay in the menstrual period, so it is necessary to carry out the examination. If the endometrium is thin about 0.8 centimeters at the time of examination, then you can take progesterone capsules orally twice a day, 100mg orally for five days, and then stop taking the medication will achieve the purpose of menstruation. At the same time, the menstruation does not come for a long time, first of all, to exclude whether there is the factor of pregnancy, at the same time, if this happens for a long time, as far as possible to check the endocrine hormones, to avoid causing prolonged menstrual irregularities.