i think you'll find that you'll have a slight numbness just above the scar indefinately as everyone has said. And as you c-s was only 4 weeks ago, it should still feel a bit sensitive for the next couple of months at least.

Ive had 3 c-s. I didnt notice the numbness too much with the first, but after the 2nd (9yrs ago) noticed it a bit more...thankfully it didnt get worse with the 3rd (4yrs ago), stayed pretty much the same and is still slightly numb.