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Last week I was 6w6d and same this week

I’m really confused I had a scan exactly a week ago and I measured 6w6d they saw the yolk sack and today I had a scan again and it measured a feature 6w6d so the age is exactly the same which is confusing me as the pregnancy has progressed and we saw the heart beating today. So how can both weeks measured the same ? Which one would be more accurate ?