Have been reading about this empty sac of mine and not all is lost. It is very common as early as I am not to see something. Also, I didn't think to tell the sonographer and haven't discussed it with my MW but I have tilted cervix which apparently can make it very difficult to see baby until at least 8 weeks. Also, I was told rather than 6w3d I was 5w5d and I do recall a week an a half ago slight spot of blood and having cramps which would indicate implantation, making those dates right!! Have a second HCG done on Monday so all FX its has at least doubled from 8224. Will let you all know next Thursday as I am now going away for a well deserved rest. Look forward to seeing all the scans when I get back xx