I went for my first appointment this past friday.  I had an ultrasound done ( 6 weeks 4 days) and the dr. only saw the sac.  She seemed positive that everything looked normal and that it was too early to see anything. I have another ultrasound this friday to see if there are any changes. I just hope and pray that something is in there this time 
                 
                
Re: A little freaked out...
I'm in the same boat. I went in and measured 6w3d last Tuesday. The u/s tech seen the sac and the fetal pole but said it was just probably too early to see the heartbeat. I go back tomorrow for another u/s. It has been a loooong week.
Good luck to you both! You'll be seeing that cute little heartbeat on that screen pretty soon.