EDD for FTS scan different from first dating scan

My first dating scan EDD was on 18th April 2023 in week 9, but after doing the FTS ultrasound in week 12, the EDD suddenly became 16th April 2023. Will the EDD keep changing with each ultrasound scan done? Which EDD should I follow ?

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Follow the first EDD. Subsequently your EDD will change based on baby’s size.