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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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