Yep, I`ve had early scans with every pregnancy. This current one at about 5.4 wks and she couldnt see anything, just an empty sac.
Its not very reassuring, but I`m sure its quite typical. With my first child they did a scan at 5.6 wks. We saw/heard a heart beat and the Dr said we were very fortunate, had it been a day earlier we probably wouldnt have seen anything.