T.K.
I was very low on weight gain my whole pregnancy. I went back and forth and in the end only gained about 15 pounds. Don't worry to much. I say get a new doctor and have him make sure the baby is ok. Other than that don't worry too much. You aren't really loosing that much in the big picture. Every pregnancy is different so don't compare to your first too much. Hope that helps!
T. :)