Weight gain

I'm 24w+3d today and I have been feeling my little girl moving all around, everyday, since about 21 weeks. For 2 days I hadn't felt her move and decided to call my doctor, since I'm a first time mom, and they said to come in just to reassure me. I went in and I have gained 11 pounds in 3 1/2 weeks. It's so discouraging and I'm wondering what other mommies to be are doing or have done to prevent so much weight gain. I'm only 12 pounds over my original starting weight, but 11 pounds just seems like so much and I started obese. They didn't say anything about it but my next appointment is Tuesday.