what is more acurate for due date

if the doctor goes by my last period my due date will be may 22 but if she goes by ultasound it will be may 1st

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    04/04/14
    4Katie
    When was the ultrasound done?

    Only early ultrasounds are accurate for dating.
    0
    About Tetyana Zinyuk
    Current: Raleigh, North Carolina
    Birth: May 21
    On Moms.com since: Jan 13, 2014
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