In this case, there is a possibility of vaginal bleeding, i.e. menstruation. In some cases, such as when a woman continues to have no menstrual flow, after ruling out the possibility of pregnancy, the appropriate ultrasound is performed beforehand to find out the thickness of the endometrium, and progesterone injections are given in appropriate amounts to bring on a menstrual flow. After the onset of menstruation, a follow-up test such as the sex hormone 6 test will be performed, and progesterone injections can be given for about 5 days. After the progesterone injection does not bring on a menstrual period, it is necessary to further rule out whether there is a lack of estrogen in the body that causes a lack of menstruation.