Plus size pregnancy

Hi ladies .. I really need some advice and would love to hear anyone’s experience, i am currently 290 pounds and really want to become pregnant. My husband and i have been ttc for a while now ever since we lost one two years ago. I went to the obgyn months back and she told me that its best to lose weight before trying again. I am trying my hardest but it doesn’t seem like the weight is going anywhere at the moment. I was Justin wondering if being this big is an actual issue for fertility and what are some tips to lose the weight

Ps. This well be my technical first time.