Kittykat I was worried with my third too...my first was 8lb10, my second 9lb13.
Even though the second birth was much better & easier I was worried about how big bub no.3 would be ...he was 8lb13, so much smaller than DS1.
It is very unusual for a woman to bake a baby too big to birth...there is a thread i think on here about it, I'll have a look & see if I can find a link for you.

don't worry hun you'll be fine.