Hiya,
I had a c/section first time around and it did cause me some discomfort at the end with my 2nd pregnancy (pulling and mild burning kind of sensation). It hasn't been so bad this time because it was 5 and a half years ago now, and I had a natural second time around.
I'd say just keep an eye on it, and if it is more than relatively mild pain perhaps contact your mw or doctor about it. I'm sure it's just stretching pain though.