This past weekend I laid down on the floor on my stomach to do some shoulder/back exercises and stretches. When I first laid down, I felt some pain in my lower abdomen. When I put my arms above my head, palms down and lifted them off the floor using my shoulder/back muscles, I felt a hard knot in my lower abdomen press into the floor. It hurt, so I put one hand under my stomach and lifted the other arm as before. I felt a hard knot/mass in the area below my belly button, to the left. I've had 3 C-sections and am concerned that this may be something resulting from those. ??