“My due date got put back by 2 weeks at the 12 week scan.

Original date given was 18 December but at the scan it was moved to 31 Dec.

early dating scan-2early dating scan-40early dating scan-85

Of course you have probably already used an online due date calculator.

This is where you discover that your due date isn't based on the date you conceived, it's actually calculated from when your last menstrual period started (your LMP). It's because it gives a definite date for health professionals to work with.

"At my 12 week scan I was back to bang on dates for my last period and was told to ignore the previous two scans, which they said were to check for 'viability' as opposed to dates.

I know it’s hard, but please try not to worry.” Adams Mum also found the date that she was given at an early dating scan was changed when she got to her dating scan.

My baby will come when it's ready anyway, maybe weeks before or maybe weeks after my due date." Like MFMer LH86 above, some of these first EDD are derived from early pregnancy scans (pic above).

These can be carried out from week 5 or 6 of pregnancy, which is a notoriously tricky time to be accurate on dates.

Understandably, when it is such early days it’s easy to worry when the scan dates are different to what you were expecting.

As Loobylou77 explains, it's really common for these to change when it comes to the dating scan at around 12 weeks.

It just doesn't quite add up by my reckoning of when I think I ovulated and when I know we did the deed!

” "I had an early scan at 8 weeks, which put me back a week," adds Abnormal Kitty.

“All the dates I was given were wrong up until my 12 week scan - which gave my EDD as one day before the date I had calculated myself!