I'm having the same pains I don't see my doctor till the first it kind worries me
I haven't got a c-section but I can imagine that the scar is kinda tight and doesn't stretch with the rest and I believe that itself can hurt a lot while the uterus is growing, add to that a kicking baby - oh my! I would suggest you look up online how to massage(?) it or what to do so it gets more comfortable.