No weight gain?

Cat

With my first, by now I'd already gained at least 5 lbs or more, but with this pregnancy I've actually lost a couple pounds. I know every pregnancy is different, but I'm pretty thin to begin with and don't usually lose weight, so I can't help but worry something's wrong. My appetite is non-existent - food grosses me out - but I'm doing my best to get as much in me as my body allows.

Of course my first appointment isn't for another couple weeks. Can this be a normal first trimester thing? Is anyone else experiencing weight loss with a healthy baby?