Can someone explain this please?

M • FTM
I'm 13weeks with di/di twins. On every ultrasound I have gotten even when I was 7wks it shows 3-4 days ahead. For example at 7wks the ultrasound showed 7wks 3days, at 9wks it showed 9wks 3days and at my 12wk ultrasound it should 12wks 5days! So do I go by this date or my original date? My OB always just says your due date will stay the same? I don't get it!

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