Weight gain/help

Hey other mommies, I don’t know why I feel like this but I was hoping not to gain any weight until possibly the end of my pregnancy. I’m 19 weeks and gained 1-2 pounds not really sure because it keeps going from 197-198. I started my pregnancy really overweight 196 and I’m so scared of gaining so much weight by the end doctor said no more then 11 pounds so that means no more then 9 pounds I’m only able to gain. What can I do to possibly lose weight healthy or workout as well. I’ve always been 140 and under but I got really sick and the medicine they gave me made me gain 50 pounds then I got pregnant before I could even lose the weight I’m really about to be 200 plus pounds