Lower abdominal vague pain is not a characteristic manifestation of pregnancy, and simply based on this symptom, it is not possible to determine whether or not you are pregnant. The causes of lower abdominal pain include: 1. In early pregnancy, due to the enlargement of the uterus and pelvic congestion, some women may experience pain and discomfort in the lower abdomen and lumbosacral area due to the stimulation of the adjacent tissues and organs. 2. Women suffer from inflammatory gynecological diseases such as pelvic connective tissue infection, endometritis and tubo-ovarian inflammation. 3, Ovarian cysts and other gynecological diseases. 4, suffering from cystitis, bladder stones and other urinary system diseases. If you have a normal sexual life, do not take contraceptive measures, and have delayed menstruation with lower abdominal pain, you should consider the possibility of pregnancy. You can visit the hospital for relevant examination and clear diagnosis.