It's so normal to feel a sense of disbelief!!! How exciting! Congratulations!!!
You can still have sex and walk and do moderate excersizing during pregnancy. I would refrain from things like horseback riding and running marathons! LOL! But you can still do excersises you feel comfortable with.
why would you even doubt your pregnant with positive pregnancy test, and your allowed to do pretty much regular excerising you normally would do, you could always ask your doctor
First off let me tell you how lucky you are to not be expierncing morning sickness.... Have you had your first OBGYN appointment? The activity level really varies per pregnancy so when you see your OB ask him.... Best of Luck and wishing you a Happy and Healthy 9 months.