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Can an ultrasound scan be 5 weeks out?

ive had scans at 6 weeks, 12 weeks and 20 weeks, and all give me roughly the same due date.

is it possible the scan could've been wrong and I am 5 weeks further gone? Is this possible?

thanks in advance xx


  • I know scans can be out by a few days but 5 weeks is a huge difference. Especially given you have had 3 scans at different periods. At 6 weeks you'd see very little, possibly just a sac, but if you were actually 11 weeks you'd see a good sized baby. Likewise at 12w scan etc. They get your date based on baby size and development. What makes you think they are wrong by 5 weeks? X

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