Just wanted to let you know that I too am pregnant- my doc tells me the same thing. "Everything is ok!"- I've lost 30 pounds during this pregnancy.
I started out overweight (HA! You think I'm telling you how much I weigh on here- not a chance).

still am by a bit. However, I worked at Pizza Hut until graduation (got my positive test on graduation day), so I sat on my butt and ate pizza several nights a week. Now I'm working 12 hour shifts where I barely get to sit down, and frequently eat dinner standing up charting. I actually move at work. So weight loss makes sense. I also eat less (no pizza every night).
My doc is not concerned. She monitors baby with ultrasound, and at my last appt (last Friday), she said baby is growing right along schedule!
Just a note to let you know that you're not alone, and apparently, it's not as a big a deal as I was afraid it would be. I thought for sure my doc would freak and put me on TPN or something. The CNA's that check me in always comment though, and it upsets me (my doc and I need to know- like I'm not aware that I've lost weight).
-A