Quoting Meg ♥:" I was *huge* at 29 weeks. My LO was 5lbs 4oz at birth. Just because you're measuring big doesn't mean baby is that big. You may just be measuring a head or you may have too much amniotic fluid. "
I was bigger my second pregnancy than I was during my first, and my second baby girl popped out smaller than her older sister! Lol. By almost a full pound. You won't really know how big the baby is until it's time for them to be born.
My tiny tiny aunt (like, 110lbs before birth tiny, she wasn't underweight, she was just a shorter skinny person lol) gave birth to a 12lb baby, no c-section needed. They let my cousin cook almost 2-3 weeks overdue before they finally induced her. If my tiny little aunt can push a 12 lb baby out, then I have faith you can have this baby too!