Left abdominal pain alone cannot be taken as a sign of pregnancy and requires detailed gynecological examination such as human chorionic gonadotropin blood value measurement and ultrasonography. In addition, even in the case of ectopic pregnancy, the pain in one side of the abdomen does not appear until at least about forty days of pregnancy. Therefore, you can use an early pregnancy test two weeks after intercourse to clarify the status of conception. If the left abdominal pain is severe, you should seek medical attention promptly.