BG, for a few weeks my tummy (low down and all the way across) felt bruised and uncomfy. It almost felt like I had done 1000 sit ups or something and every little movement that used my tummy muscles (pretty much everything!) was really uncomfortable. It lasted a few weeks and started around 20w from memory. Now it only happens occassionally, but seems to be have replaced mostly with pelvic pain whenever I go to sit or stand. Probably not helped by the fact that there's a 1kgish baby using my pelvic floor as a trampoline!