34 weeks.. increased appetite, but dont want to overeat...afraid of big baby & c-section!! normal?

no im not saying that im going to starve myself because im in fear of having a big baby! but i just feel like i have been eating so much lately. i was 100lbs 5' 5" pre pregnancy, and i have gained 45lbs so far. i have been eating 3 meals a day with a few healthy snacks in between but now its like i want to eat more than that! i am very worried about having a big baby, and having to have a c-section. my doctor told me if the baby was big i couldnt deliver it lly, they would have to do a c-section. im not saying im going to stop eating or cut down but i dont know what to do! i eat healthy foods i dont eat junkfood. and im gaining like crazy. i actually like the extra weight (i hated being skinny my whole life i was always so petite) i walk alot at work and have a really busy schedule with trying to get the nursery put together and everything that i really dont have extra time to workout! does anyone feel like this or did you when you were this far along? is it normal to worry about these things or am i being crazy? lol thank you :)