I was about 60 pounds overweight when I got pregnant and then gained another 40 pounds. This put a lot of strain on my body which is why I think I developed hypertension and had my baby two months prematurely. If you can lose any weight at all before getting pregnant do it. Drink tons of water, try to get at least 20 minutes of exercise every day and stay away from all salty foods, junk foods, sodas, and highly-processed foods.