Early weight gain

Hope

So I'm 7 and 1/2 weeks right now and I've already gained a good bit of weight. Which I don't understand because I can hardly eat anything. The thought of most foods makes my stomach ache and I am only eat fruits and veggies. I only eat twice a day. A small snack and one meal cause I'm so sick most the time, but I've put on weight and this is my first pregnancy. Is this normal? (Me at 4 weeks vs me now)