I'm on the cuddly side too - between a 16 and a 20 depending on the clothes... I volunteered to my OB that I wanted to watch my weight and he said that was totally up to me, I didn't need to put on any for a healthy pregnancy, but also didn't need to worry about it if I did... I'm in at the birth centre here, no bp issues, no gd, no spd... boringly low-risk all round. I've probably gained about 5kg since falling pg, and I'm 37wks on Mon... My mum was larger with my brother (maybe a 22), also had no issues with her health and it was never suggested that she'd have to have a C-section or anything...