a little concerned

AmyT107

I had my first doctor's appointment today thinking I was in my 6th week of pregnancy.  Upon getting the ultrasound, the ultrasound tech asked me if I was right on the dates of my cycle because the sack was measuring 5 weeks and 5 days.  I could see the sack, but nothing that resembled a blob, peanut, or anything that resembled the shape I had seen with my first two children.  I understand not seeing a heartbeat yet, but literally all I could see was a sack.  Has anyone one else run into this situation?