I had a dating scan done with this pregnancy as I had bleeding early on so was sent off to check it out.
I 100% know that my LMP was 23 May 2009 as I had been following them for the last three months and had written the dates down in my diary. This giving me a EDD of 27 Feb 2010.

So off for the scan and it was very early and nearly didnt pick up the heartbeat plus it was not an internal scan so not exactly the most accurate but it gave me an EDD of 7 Mar 2010.

Was not happy because I knew my period date was bang on. Fast forward to my NT scan and was told she had big date discrepancies. I told her where I had the dating scan done and she was like "oh I see, we have had some big differences compared to them on quite a few occasions" she gave me 25 Feb 2010. I was stoked with this as it was inline with my period dates.
When I had my first hospital appt the Dr was happy to take my NT date as he said it was likely to be more accurate because the first scan was not an internal one,the crown rump length was given as "approximately" 6weeks and I was so sure about my dates.

So all along I have been following the 25th as being my due date. Today however the midwife tells me she is going to have to check up on this because they always go by the dating scan and more likely this is the date they will use!The 7 of March WTF!!!!!
That gives me another 9 days plus my history of going overdue i am spewing.
I burst into tears and told her what the Dr (who unfortunately has now left) had said etc, why cant she just leave it as everyone has been happy with it but she is going to check and ring me back tommorrow.
Not friggen happy I tell ya. She did say that they would not let me go past the 7th but that still seems like so far away.