I weighed 159 before I got pregnant with my first baby. I gained 70 pounds. It sucked. I was depressed for months over it. Now I weight 212 and I am pregnant again. I'm absolutely terrified of getting huge!!!
I was obese (still am) when I got pregnant with both my kids. I was about 290 when I got pregnent with my DS. I gained about 15lbs with him and he was a healthy little guy born 9 days early and weighed 7lbs 9oz. With my DD I was at 300 and I ended up gaining only 5lbs total with her. I was up to about 15lbs but found out I had GD and lost just about 10lbs in the last 10 weeks. She was born a week early (they induced me) and she was 7lbs 4oz.
My DS is now almost 4 and my DD is 5 months today. We are all very healthy...and since I had my DD I have lost about 20 lbs sticking to the diet I was on due to the GD. If you have any concerns talk about them with your doc. They will most likely be more than happy to answer them for you.