Well, I've now got to go back to the doctor, get another referral, and have another "dating" scan, since the radiologist wasn't all that bright and didn't have as much of a look as she should have. She tried to argue with me over how far along I should be. She came out with"but that would mean you ovulated when you were already pregnant!" when I told her I knew my O date was March 28 and my LMP was at the beginning of February. She even had an option on the screen to input the conception date rather than LMP! I have no idea what her problem was...