If you have not had your period and have lower abdominal pain by the time you get your period, there are often the following reasons: 1. You must first rule out the possibility of pregnancy, and it is recommended that you use early morning pregnancy test paper to do material testing. 2. It is likely that endocrine disorders are caused by endocrine disorders, which can lead to changes in the menstrual cycle and pelvic congestion before menstruation, so it can cause pain in the lower abdomen. 3. 3. Because of chronic pelvic inflammatory disease, if the pelvic cavity becomes congested after menopause, it may also cause pain in the lower abdomen. If you are not pregnant, you can take progesterone orally to promote menstruation, once a day, 2 capsules for 3 days, and your period will come 3-7 days after you stop taking it.