Couple questions about 1st ultrasound

Brittany

My first ultrasound was today! They said i was measuring a week ahead at 12 weeks 3 days.. Do i go by that due date June 21 or my original June 26 by my LMP? Also on the side of my ultrasound it says something about 16 cm..what does that mean? Any ultrasound techs out there able to clarify? Or anyone else who might know? Thanks!

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