Plus size and Frustrated

I have been plus size all of my life. I got pregnant with my first son after dropping from 295 - 258. We had been trying and trying and then the moment I decided it wasnt going to happen, it did. The doctor said it was the weight loss. Awesome! After I had my son I had gotten all the way up to 318. Immediately worked on loosing weight and did great. My weight has always been an issue. This time around I weighed 298 prebaby. Lost weight due to morning sickness in first trimester. I am now up to 306. My doctor told me my weight gain goal is 10-15lbs. Ive already gained 8 and am freaking out. I have tried so much to eat healthy this time. I dont want to gain as much weight as I did. I stress about it. I am 28 wks. The doctors just did an ultrasound and are having issues getting a good look at my son. I have to have another ultrasound. They dont say its my weight but seem to make little hints that it is. This past one they told me that my weight gain is a little much at this point since I am only supposed to to gain 0-10lbs. It changed... *sigh* Im over it. Its not my ideal weight I am at. We didnt really intend for me to get pregnant this time. It hurts to hear everytime I go in that I am a this and I am that. I have to see the actual ob and not midwives because of my weight. I havent had any issues other than back pain and I ended up with a kidney infection. Otherwise my blood pressure is great. Last check it was 118/64. Ive gaine 8 pounds. At this point in my last pregnancy i had gained 30lbs and was starting to rise in blood pressure. I feel like I should stop eating sometimes. I feel so judged by everyone because Im pregnant and plus size. Like I shouldnt be trying to have a family. I just am over it. When I tell people Im pregnant they are completely surprised like 'Oh just thought you were getting fatter!'. My life is stressful enough and I just am having issues dealing with the negatives that I am getting just from my doctors. Theres 12 wks left and this is the weight gain stage. I just dont know what to do.