Gaining weight.. Because of nausea

I have created a system for myself in the last week or so where I eat every few hours in order to prevent nausea from overtaking me. I sometimes can eat something small, sometimes it has to be quite a bit, but it seems to be working. The part that's not working is that I feel like I'm gaining so much weight. I haven't weighed myself in about a week, but my clothes are tighter. I'm only 8 weeks so I shouldn't be gaining, but if I eat how much I would normally eat, I feel nauseated. Any tips or advice?