Which Due date is right?

Loreal • Baby #2 due in August 👦🏻👶🏻

Based on my LMP my due date is 8/13. At my first ultrasound they said I was measuring a week behind and due date was 8/21, then my second ultrasound they said 8/19....what do you measure your due date by? I know my LMP is accurate since I track it in an app....

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