firstly, this pain is NOT normal. I advise that you contact your dr immediately
I had the same type of pains with my 2nd pregnancy - my first was a c-section. I was absolutely terrified, so I called my doctor. He had me come in right away, checked everything out and everything was fine. I also had a HUGE ovarian cyst (the size of a grapefruit), so he said that the cyst may have been causing extra discomfort. The cyst went away on its own as the pregnancy progressed and eventually the pains went away. I only had them once in a while, usually when I coughed or sneezed. Dealing with pregnancy after a c-section is much different than having a normal vaginal delivery.
I would definitely call your doctor and get it checked out. Better to be safe than sorry. Good luck and let us know how it goes!