Overweight and pregnant.

I am overweight but I do not look what I weigh. I am 5 weeks 4 days pregnant. Any advice on how to maintain and gain the least amount of weight as possible? I'm so worried about my weight with this pregnancy. I have PCOS and becoming pregnant was a shocker to begin with. My husband and I have been trying for over a year and it happened as soon as I started using the glow app!