I too am 11 1/2 weeks...I have now seen the heartbeat 3 times and heard it twice...I m/c'd in Aug 07 so I was pretty paranoid in the beginning. Now I've calmed down some, I just want the next 6 weeks or so to FLY by so I can find out what the sex is and start buying stuff.
I have been paranoid my whole pregnancy so far. I felt like the 12th week would NEVER get there! But it did and now I'm 19 wks! Try to relax- I know, easier said than done. Before you know it, the time will pass. I agree, having so much info accessible to us now can be helpful but it can also give us a bunch of stuff to worry about we would never have thought of on our own.
Best wishes!!