it can just be too early, even at 7-8 weeks baby is only about 2mm long! so at 5-6 weeks (you could possibly be earlier than you think..and just being out by a few days can make a big difference in bubs development..) sometimes they just cant see baby yet. it could also mean that baby just hasn't formed, and there IS just a sac, meaning a chemical pregnancy (body thinks its pregnant but it isnt, essentially)... BUT keep positive, i know its freaky, but it could well turn out just fine. its the risk of getting a too-early scan

sounds like the scan lady was awful though.. not cool at all! hugs! xx