Losing weight??

Hello! I’ll be 10 weeks on Saturday and this pregnancy is a little different from my first. With my first, I gained 55lbs total and 13 of those in the 1st trimester. I’m getting closer and closer to my 2nd trimester and I’ve actually lost a little over 1lb. I know 1lb isn’t a big deal, but that’s a significant difference between pregnancies. This time around I haven’t really been eating much (maybe 1200cals a day, I know, I know, don’t crucify me for it). Is it just the lack of appetite or should I be concerned about something medically? I don’t have any nausea and haven’t even thrown up once.