Thankyou, yes after thinking about it, I think what's happened is my doctor has gone of my LMP. I have only had one period since my 9 month old baby, and prior to that had more like a 40 day cycle. I had an implantation bleed on Aug 8 & 9, with a faint positive on he 11th then much darker a week later. So going off that, maybe 5w 5d is right......I'll ask for another scan to ease my mind.