Loosing weight

Last time I went to my appointment, I weight 218 pounds... it's the biggest I've ever been. I used to weight 160 and then I got on nexplanon and I gained so much weight , I regret getting on it. It also had to do w the fact that I didn't watch what I was eating either. I took it off after being on it for 2 years. I got pregnant 3 months after. I am currently 9 weeks. And my doctor is demanding that I loose weight and to be on a diet Bc of the risks there can be. And I want to do it, I'm willing to do anything to have a healthy weight and healthy pregnancy. But I need help. I'm not really good with diets, can you ladies give me any ideas? It'll be so helpful honestly. I haven't told my family that I'm pregnant, because I know they will not be happy because of my weight. I just came to see my aunt and she just talked about how fat I am. So I want to make this change for the better and to be healthy. Any tips, ideas ? 😐