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I remember the study were the measuring was being used for accuracy of the nub. If you think about it... it is the only was to estimate gestation and most women don't know when they ovulated anyway!! For me I think when you know you ovulated as I knew I ovulated and when I conceived ds3!! I was sure I was a week behind what they told me at my nt scan!! They told me 13 weeks and I thought from when I Ovulated I would be just under 12 weeks!! Well let me just say my tech said girl and I had a pretty girly looking nub shot and gave birth to my 3rd son :) I still believe it was because they gave me the wrong dates and the nub just didn't have the maturity to have worked its way up!! That's just my opinion anyway!! I only have little baby's yet all 4 of my son's measured a week later at the NT scan regardless of dates! I know for sure with the last two when I oed the first two I was not charting and with my first they induced me because I was late from scans and when he was born they said he looked under or just cooked and had a few breathing issues! So in yapping on about al that my opinion is if you "know" for sure without any doubt I would go with that!!
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I believe if you are sure of your ovulation date, then it is more accurate to go by that then the measurements. But this is my very unscientific knowledge ;)
