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ultrasound, conception

does anyone know how many days not weeks are ultrasounds off by at a 13 week scan?
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202436 tn?1326474333
With early scans it's usually no more than a week either way.  As the pregnancy progresses it can be off as much as two weeks.  With that said, the earlier the scan, the higher the accuracy rate.
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1194973 tn?1385503904
Generally no more than 2 weeks (14 days) but they're normally only off by just a few days. Since this is an earlier scan, it might not be off at all. Not all scans are.
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