I am 7 weeks pregnant. I did a 30 min ab class a few days ago which included full situps with a medicine ball, twisting with the ball, and full leg lifts. I know now that I shouldn't have done these exercises. My abdomen feels like I strained or pulled something inside and I have some light brown spotting. I did call my Dr on the spotting and have ceased exercise. I am wondering if I have done something to my abdominals or possibly have damaged something internally?