Weight gain so far??

Ok so I had my 32 week ultrasound done today and everything looks super healthy with our baby boy. The only thing was that the doc said I have an extremely fast and high metabolism and uterine transfer of nutrients. Meaning that the baby is basically getting everything that I am eating. He has therefore got a really big belly and is pretty chubby for this stage. The doc said he would probably still be only around 7 1/2 lbs at birth because of his height but that his belly and shoulders could cause issues for me at birth with their larger size. I am so bummed out because no one told me I should have been watching a lot more about what I eat and i had no idea I should have only put on between 15 and 18 pounds the entire pregnancy. I have so far put on 24lbs all in my bump and thought I was doing so well. I'm happy baby is so healthy but would hate to end up with a c-section because of his size/shape! 
​Just curious if anyone else has had anything similar and how much weight you have all gained thus far?? 
​Thanks! X