Overweight and trying to conceive...

My husband and I are trying to get pregnant. I am overweight. I have had 2 miscarriages, second one involving a D&C because I was 3 months. I’m using the fertility tracker and using an ovulation predictor kit. I also found out 3 weeks ago that I have PCOS, my doctor started me on Metformin to regulate my hormones. 2 days after starting the Metformin I started my cycle. By the tracker I should Ovulate on Wednesday. I hope this works! Anyone else having a hard time getting pregnant being over weight? Give me some tips if anyone has any!