If the menstrual period is delayed and accompanied by stomach pain, it is an abnormal phenomenon. In this case, if there is normal sexual life without contraception, the possibility of ectopic pregnancy must be ruled out, so it is recommended to draw blood to check blood HCG, or use the morning urine to test urine HCG. if the possibility of pregnancy has been ruled out, it is recommended to do ultrasound, mainly to find out whether there is the possibility of pelvic tumors. If there is no pelvic tumor, it is recommended to do gynecological examination to know whether there is pelvic inflammation, and then give treatment according to the results. In addition, clinically recommended oral progesterone to promote menstruation, can be taken orally progesterone pills, once a day, once 2 pills, for 3 days, usually 3-7 days after stopping the drug will come to menstruation.