6 weeks pregnant and feel horrible about myself

I am only six weeks and 3 days, but I already gained three pounds. I've been eating the same as before I found out I was pregnant and I'm generally a very healthy eater. I feel so ugly and fat. I have struggled with an eating disorder since I was in high school. I know I have to eat normally and regularly and I know you are not actually "eating for two". I try to go for 15-30 minute walks a few times a week. Has this happened to anyone? Does anyone else feel this way so early?