Accuracy sonogram dating

I had my 12 week ultrasound last week and the tech dated me at 11 weeks, 4 days.I'm 99.9999999 % sure of when we conceived and I'm fairly certain that the tech was 3 days off.

Doppler Ultrasound – This imaging procedure measures slight changes in the frequency of the ultrasound waves as they bounce off moving objects, such as blood cells.

They came with the due date of 12-12-12 based on the second ultrasound.

Just curious which would be more accurate being as that i have been told the sooner the sonogram is done the more accurate it is.

Most dating scans are done with a trans-abdominal transducer and a fullish bladder.

If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.

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