Did you use late adjusted ultrasound date?

Hi ladies! My original due date was Jan 6th. I only did one anatomy ultrasound at 19 weeks and it gave me a due date of December 27th. My midwife didn't change my "due date" but I've had these 2 dates all along. I haven't really been hung up on a "due date" and am happy for babe to come when it's ready but...now as I'm closer to the end I'm getting curious of which date to kinda rely on...with flexibility of course! Anyone else have only the late ultrasound and change their due date bc of measuring ahead and actually have babe be earlier? Any similar experiences?