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If it is an early scan you must have got pregnant the month before. If it is a late scan (after 30 weeks) you may have a big baby. An early scan cannot be 4 weeks off. http://www.genetree.com/about/conception-calculator.asp

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Q: What would be the most logical reason that a baby would measure 4 weeks ahead on an ultrasound and can a scan be that much off?
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