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Due dates are also calculated based on the baby's body length during an ultrasound between eight and 12 weeks of pregnancy, according to Dr. Sachchidananda Maiti, England-based obstetrician and gynecologist.
Until your dating scan your pregnancy will be counted from the first day of your LMP (last menstrual period), although ovulation will generally occur two weeks after your LMP, which is when you technically become pregnant. In simple terms, your due day is the first day of your last period, plus 40 weeks.