You never told us you were expecting either!! Congrats and I wouldn't worry too much about not being able to see the hb yet. It is still too early.
I personally do not believe in u/s this early since all studies show they can cause more miscarriages than anything else at this time. Plus even if it isn't a viable pregnancy then the u/s can't do much for you anyways. I think doctors are machine dependant.
I say relax as much as you can and enjoy the fact that you are pregnant!