The premenstrual abdominal pain does not necessarily mean that you are pregnant. The prostaglandins released in the body before menstruation can cause the blood vessels in the pelvis to dilate, causing congestion and stimulating the sacral ligament nerves, resulting in pain in the small abdomen and soreness in the lower back. To determine whether you are pregnant or not, you cannot judge by your performance because there will be errors. You need to go to the hospital for a urine HCG test 12 days after intercourse or have a blood test for HCG 8 days after intercourse to make a detailed determination of whether you are pregnant or not. If the test result is negative, it means that there is no conception and the abdominal pain is caused by PMS, so be patient and wait for your period.