Lost 7 pounds

So I'm in my first trimester with my second.. I don't want to eat, most things make me nauseated. I only eat small amounts when I do, more snacking than actual meals.. But I just stepped on a scale and I've lost 7 pounds in the last 2-3 weeks and that makes me very nervous.. I am overweight (not obese) but overweight so I don't feel bad about shedding the pounds other than I don't know how it's affecting the baby? Any advice, support, comforting words?