Hi Shell!
Normal - yes, i think so. Im like you, didnt do it with my DD but with this one i cant help myself. Im not having the dreams though. My main problem is i have too much time on my hands (thinking way too much about anything!) When i feel myself starting to worry or think this way i just get up and do something different to take my mind off it. I think everyone worries about this sort of thing to some degree, esp with not being able to see the little bubs!
Dont worry too much - im sure your bubs is fine!