early scan

Charlotte
So according to my dates I should be just over 7 weeks. However I went for an early scan last night and we hit a snag. The pregnancy sac is there as is the yolk sack, so all signs of pregnancy are there. However bubs wasn't visible due to either being too small..meaning I'm earlier than expected which is what the lady thinks, or bubs has already gone :-(. After 2 misscarages before having my little girl, I'm now neurotic. Due to go back in 2 weeks for a rescan. Has anyone had this? Xx