This was something I did not understand. My U/S put me 3 days ahead regardless of my LMP being spot on. How's this possible? AF wasnt early or anything but I did ovulate early- STILL ovulating early shouldnt make a difference to your dates if your LMP was right on time, should it? Im seeing the midwife today and she will ask my LMP- if she judges it by that then i'll only be 10weeks and 2 days when actually I'm 3 days infront. I just dont understand this at all. Should I take my scan report???? also i know if i do take my scan report, my nhs u/s wont be at 12 weeks, it'll be later basically because i've had a scan already.. so what does one do??