35 weeks and weight gain

Ok so I get it...we are growing a human in us and we are supposed to gain weight im not oblivious to this. But I never thought I would gain 20 lbs. I'm so stuck on my weight I've always had issues with insecurity when it comes to my weight. I've always been little my family has big people so staying small is very important to me. My s/o doesn't understand my issue with weight he finds it funny and I'm sitting in the drs office trying not to have an anxiety attack. .....sorry just needed to vent