Due date calculators are generally considered accurate within 7 days. Typically, most practitioners don't adjust due dates in either direction if the discrepancy between the two possible dates is less than 7 days. And that's true even of early ultrasounds.
There are generally two ways of measuring a pregnancy, LMP (last menstrual period) and gestational. Most due date calculators go by LMP, which calculates a pregnancy at 40 weeks or 10 lunar (4 week) months.
LMP would mean that ovulation
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