Gaining weight a little too fast

So I'm 17+6 weeks and I'm up 15 pounds 😱 I don't understand how its possible when I'm literally throwing everything up after I eat I don't even eat much eather I have to force myself to eat my ob wanted me to only gain 10-15 pounds and I'm already pushing the 200 pounds I'm freaking out because I've never been in the 200 and I still got a long way to go should I be concerned it's making me very upset cuz I just feel fat 😩