Due Date Confusion

NicJen424

So, we are having some due date confusion over here and are not sure what date to go with. My first appointment with my OB isn't until Nov. 9th and I am don?t want to wait that long to get an answer!  Originally we calculated it based on LMP and FF?s O date since they came out to the same EDD. Then the RE told us another date based on what she said was ovulation (second IUI day)...but according to every online calculator (and I have done a good 10+ or so) that date is not based on either.  So here is what we know: Based on LMP: June 6th 2012 Based on FF's ovulation date: June 6th 2012 Based on second IUI date (ultrasound detected no O the morning of the 1^st IUI, probably O?d that night): June 7th 2012 Random date from Dr.: June 9th 2012?????? Ultrasound dated baby at 6w3d (I thought I was 6w5d going in and told 6w2d coming out)
What do you guys think? I don't want to question the RE (not my normal RE) but I am thinking she was wrong!!