My doctor gave me my first due date of 29 July. I was only 6wks and four days when i had my first ultrasound which gave me a date of 9 August. Since then ive had 2 more scans (one cos i had some spotting and i had my nuchal translucency a week ago today) and they each had different edds!!
The one im going off is my first date given to me by my doctor - baby will come when he or she wants to anyway - and probably not on any of the dates ive been given! LOL!
But i think you are right about the most correct scan being the first crown to rump measurement because i have 3 possible conception dates and my fist scan is the only one that matches up with one of those days!
Did your doctor not give you a due date? The most correct scan is usually your first Crown to Rump measurement. which is the first measurement of the baby around the 8 week mark. My doctors will only change that date if subsequent scans are off by more than a week. But you should ask your doctor and they will gie you your due date.
i have 2, but not 4. going by my last period I am due Aug 17th and then i had an ultrasound and going by that they said that I am due Aug 27th. i know it's only 10 days, but still at this point in the pregnancy i was like yay I'm 10 weeks, just to find out i'm only 8 1/2 (at the ultrasound, now 9 1/2 going by the ultrasound) at least on the positive baby is healthy and levels are doubling. So i'm happy as long as the baby is healthy!! Good luck with you dates! maybe just go with the one in the middle!