I'm down at least 7 pounds still, I think. (Hyperemesis.) I'm pretty thin to begin with, but I'm not worried, because I know once I start feeling better, I'll have no problem gaining.
With ds2, I gained ~8 lbs. in a very short period of time during the first tri (when I was eating absolutely nothing, just like now). It felt like water (I felt puffy), and a skinny-mini childless OB at my clinic harassed me about it (I harassed right back).
With both boys, I gained at least 35 lbs, had large babies, sweated off an ungodly amount of water in the week or so after the birth, had only a few pounds left to lose ~2 weeks PP, and lost it all by 5 months. At this point, I kind of figure my body will do what it's going to do, no matter what "they" tell me it's supposed to do.
I know it can be hard to just go with the flow, but I think many of us (I'm raising my hand) do not have textbook lovely pregnancies with tiny little bumps on skinny little bodies. I think I look pretty good when I'm not pregnant, though, and I have great kids.
Even though I don't particularly like being pregnant, I have a lot of respect for what my body can do now.