I gained quite a bit in the first trimester, mostly because if I wasn't eating I was intensely nauseated, so I ate around the clock. I never threw up though, thank goodness. Everything healthy (kale, spinach, citrus, brown rice, eggs, etc.) all made me gag. Lovely!
I've settled down at what looks like a 10 lb. gained mark @ 11 weeks - it's held steady for 2 weeks. I think most of that was gained between weeks 8-10 when I felt the worst. I'm normally a really healthy eater (vegetarian, low sugar) so I think now that I'm not so sick I'll be back to my normal eating habits and feel much better. I'm hoping to keep my weight down going forward and stick to the 1/2 lb a week.