Pregnancy Weight Gain

I try not to focus on how much weight I gain, rather how healthy I am eating. I guess that's because that's the way my midwife looks at it. Having said that, though, I am concerned that I'm not gaining enough. I am seven months pregnant and I've gained about fifteen pounds. Most of that is in my belly. I have had pre-e in the past so keeping an eye on my weight is important to me, since gaining too quickly can be a symptom.