If you feel that you are going to have your period and you don’t have it, first of all, you need to take a blood test to check the HCG level to rule out pregnancy as the reason for not having your period. If the HCG value does not rise, it is considered that the absence of menstruation is caused by menstrual disorder. If the endometrium is thin and the sex hormone count indicates a postmenopausal level, consider hormone replacement therapy in this case. If the sex hormone count is within the normal range and the endometrium is higher than 0.5cm on ultrasound, progesterone withdrawal therapy can be given in this case, such as dydrogesterone 10mg orally twice daily for 10 days, and stop taking the drug and wait for menstruation to come.