which is more accurate?

Based on my ultra sound due date ko is sept 20,2020. Pero sabi mg OB ko based sa first day of last mens ko which is january 1,2020 due date ko po dapat qy oct. 10,2020. Alin po ba ang mas accurate na basis for EDD??? Tsaka ano po kaya possible reason bakit nagkakaiba?

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Super Mum

If regular period mommy, most probably LMP po ang pagbabasehan.