Weight gain suggestions?

My doc is upset that I hardly gained anything in my first trimester and I'm about to be 14 weeks/2nd trimester with twins.

I'm plus size. I feel fine. Babies are measuring exactly on target with week/day.

I disagree a bit with my MFM doctor. I eat low carb and doc wants me eating way more carbs.

All of my other docs are begging me not to change my diet since all of my numbers and blood work are the best they've been in 10 years.

Do you think we're ok? How much are you aiming to gain if you're plus sized with twins?