Seven days after the application and withdrawal of dydrogesterone, if there is still no menstruation, further examination is required. First of all, the possibility of pregnancy should be ruled out again, after which estrogen test should be given again. If there is still no menstruation after the application of dydrogesterone and the cessation of estrogen, it is considered that the endometrium is not responding, and it is necessary to find out whether there are obvious adhesions in the uterine cavity according to the situation, and in this case, it is necessary to carry out a hysteroscopy to find out the situation of the uterine lining. If adhesions are detected during the hysteroscopy, it is necessary to perform a separation of the adhesions at the same time. After the separation, estrogen and other medications are applied to further minimize the possibility of recurrence of the adhesions.