7 weeks and growing out of my clothes

So today is 7 weeks and 1 day! Lately I have been feeling very full, and if I eat something I may just explode. I have been told it could be a vary of things. And some of my clothes are starting to fit tighter now and I do not have to wear belts to keep up some of my pants. So mom and I went clothes shopping today. I got some really cute yoga looking capris and 3 tops to wear along with 2 knit vests. Then we went to Motherhood Maternity. I must say they have some cute clothes in there for mommies to be. I was kinda shocked. As I was trying on the clothes, I saw the belly you can try on with your clothes. Boy oh boy did I feel like I was going to be HUGE when my 9 months comes around. I ended up getting some cute khaki capris and 2 shirts there as well. And I signed up for some coupons for diapers and such. Yesterday I had severe nausea. I sat up in the bed and got ready to get up, and I thought it was coming. So I had Mike get me some Sprite and I had about 3 sips of that, then layed back down. The feeling started to go away, but every time I tried to get up I felt it again. And along with that I felt light headed, Mike thinks it was my blood pressure was getting too low. So I layed in bed for a little while. Then we had some scrambled eggs. The smell of that was making it worse. And I'm thinking no this can't be happening, I love eggs. I ate some eggs and some toast, and the feeling went away. (Thank God) So pretty much most of the morning we were lazy. In the afternoon we went out to the Pottery Bar to pick up our pottery we did for my birthday, and on the way out there I wanted some Chick Fil A! Then we drive by Sonny's, and then I changed my mind I wanted Sonny's salad bar and smokey turkey sandwich. So we ate Sonny's for lunch then came back home and watched a movie. I was so tired, I kept falling asleep. Lately I have been so drained and wanting to do nothing but rest. I guess I will start walking alot more to get my energy level up.