A little discouraged

So I have been referred to a high risk doctor and now have to deliver at a hospital 45 mins away because of my weight..... I've always struggled with my weight and it's even worse now because I'm going to get huge with this pregnancy but also, how can I safely try to lose weight so my baby is healthy and I don't have any further complication??? Any advice from any ladies who have had the same problem but got their lives together and lost some weight in a healthy way.?