I'm so worried about my weight I have been gaining 9 pounds each month, I try my best but I don't…

I'm so worried about my weight I have been gaining 9 pounds each month, I try my best but I don't know what is going on! Before getting pregnant I was 150 Lb NOW I'm 209 my doctor keep telling to lose weight and I walk 30 minutes every I never ever eat food from out side I really need a great tip!!! 😓😓😓