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If I got my nub pic at 11w3d (weeks based on an earlier dating ultrasound as well as the day I know I conceived), but I was measuring 12w2d, would my scan have the decreased accuracy that an 11 week scan has, or would it be more reliable than that because of measuring ahead?
Thanks!
The nub goes by gestational age so youd have a 12.2week nub not an 11day one
The nub goes by scan age, not LMP dates and so it would be more accurate than a 11 week scan. The best time for nub guessing is around 13-14 weeks though, if you get a good shot at this time it can be about 97% accurate :) x