Sakit perut bile rolling side to side at 7 months is quite common actually, sebab baby dah besar dan ligaments kamu stretching, tapi since it's your first pregnancy better check with your doc just to be safe lah, a few of us went through similar things and doktor kami chill je, just wanted to rule out anything else. Dalam meantime, try rolling slowly and support your bump dengan pillow, it helps!