I feel bad 💔

I went to the doctor last monday and after a month of him being completely negative with me he finally tells me I am to big and not to gain no more then 15 pounds. I have always been thick set but I don't look as big as I weigh. I feel like he was being rude with how he worded it. I don't want to reach 300 pounds during my pregnancy so what do I do..... I can't eat due to morning sickness and I try to drink water and exercise. is there anything else I can do to cut down the pounds