It could still be gas.. try to take somegas medicine and see if it helps
T.m.i but I'm also 4 weeks and have gas pain. If the pain is usually one sided it could be something wrong, but for me, the pain was from the constipation I experience which also caused the gas to have a hard time releasing! If it worries you don't hesitate to see a doctor! Best of luck to you my fellow one - monther :)