weight gain at 8 weeks

Dahna
I am only 8 weeks, and it seems like I've gained 5 lbs already. I'm not 100% sure of my pre-pregnancy weight, but I'm roughly estimating. The things is, I've been eating significantly less, so either it is bloating or a hormonal thing. I haven't been active lately, but the nausea has made my diet much more restricted. Anyone else have this happen?