Measuring ahead of schedule FET

So I just had my first ultrasound today and we were able to see the gestational sac and the yolk sac. We go pregnant through IVF via FET and according to my transfer date with a 5 day blastocyst I am 5+2. But the ultrasound shows me at 6+2.
Has that happened to anyone? Does this mean my due date is earlier than expected?
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