I had a resection in June 2006 and have a 6 inch or so scar about
an inch below my belly button. Mine didn't heal all that great - it turned into a keloid. I'm now 27 weeks pregnant with #2 and it's stretched out just fine. I am a little bigger below and above it so I think the baby is just going to have to make do with having that part of my tummy not be as big as she grows but it's been fine. I did have some twinges around it in the first trimester when I first started growing a little bit but nothing now.
Good luck with your pregnancy!