If you do not have a period and cannot detect pregnancy, you should go to the hospital for another blood HCG test, if the result is negative, it proves that you are not pregnant and you can do menstrual regulation. First of all, you can give progestin treatment. After progestin treatment, you will have menstruation for about 1 week, but if you still do not have menstruation, it means that your body lacks estrogen. At this time, you should go to the hospital to check the hormone six items to understand the current ovarian secretion, and also do a gynecological ultrasound to understand the morphology of the uterus, both ovaries and the thickness of the endometrium, according to the examination results, the location and cause of the lesion can be clarified. Adjustment of menstrual cycle is mainly hormone supplementation therapy, the application of hormones is complicated and contraindicated, so it must be used only under the guidance of a professional doctor.