People with Gestational diabetes please.

Hey ladies I've been on my GD diet for 3weeks now and I have lost 4lbs. Has anyone else experienced this. It worries me cuz I shouldn't be losing weight while pregnant. The pamphlet I got says I could lose 1-2lbs in the 1st couple weeks but if I don't start gaining weight after 2weeks to consult my Doc. I feel like I could be starving the baby cuz I do find myself hungry a lot and not being able to eat cuz of the carb restriction. I have an appointment on the 18th with the OB.