I am going against the grain here, but if I were you I would book in a CS. I went through pretty much every type of birth you can have except for forceps (started natural, had epi after 7 hours, pushed for 2 and a half hours no success, prepped for theater, tried suction, continued pushing, no success until c section got my baby out in 2 minutes).

I don't think anyone can really estimate how big your baby will be. Even how big you were at birth is not really a sure fire way of telling, (I was 5.5 pounds(or 2.5kg, tiiiny ! and my dd was 8.8 pounds (or 4.03kg), not so tiny )

Really it is such a personal choice and ultimately you will really have to weigh up how you feel, but for me I will be booking in for a c-section rather than possibly put my child and myself through that whole trauma again.

Good luck with whatever choice you make and remember that no one has the right to judge you on a decision you make for your body, which ever way you may go. We are here to support you