It is possible to be pregnant if you have stomach pains but no menstrual period and your period is delayed for 4 days. If you have sexual intercourse without contraception, you should first rule out unwanted pregnancy. You can use test paper or come to the hospital to draw blood to rule out pregnancy more than 12 days after the last intercourse. Of course, this symptom is not 100% indicative of pregnancy, but may also be caused by endocrine disorders or ovulation abnormalities that delay menstruation. If your stomach hurts but you don’t have your period, it may be a symptom of pelvic congestion before you get your period. If the thickness of the endometrium is moderate, you can take progesterone capsules or dydrogesterone tablets to promote the onset of menstruation.