That happened with my last pregnancy. Went to what I thought was a 6 week and some days scan only to see nothing but an empty sac. Went back 2 weeks later and everything was fine. Check out my posts from October of last year.
At my 6 week scan (6+2) my bean measured 6.6mm which put it almost spot on (roughly 6 and a half weeks). The only thing I can say is using your CD1 as a reference doesn't sometimes work because people ovulate and concieve at different days some earlier some later. If you did oconceive later you might be a few days behind. I wouldn't worry too much if you get another scan in say a week or so, you'll find more and even a heartbeat hopefully....goodluck and keep is posted pls...xx
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