Everyone is so different...as is every pregnancy. It's normal to feel good as you get closer to 12 weeks. My first pregnancy was like that. Suddenly around week 11 or 12 I felt awesome...better than my "non-pregnant" days possibly b/c I was so happy! I'm on my second preganancy and it took at least four months to get rid of the morning sickness and I'm still fairly tired. That being said, always, always, always call your doctor's office if you are worried about something. There is no sense in sitting and stressing about something when a phone call can put you at ease. If there's anything to worry about, your doctor will deal with it immediately and if he/she doesn't, look for a new doctor. These forums are great for reassurance, but since we're all different, it doesn't hurt to make a phone call.
CONGRATULATIONS!!!