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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.
Two ultrasound exams are performed over the course of your pregnancy-one in the first trimester and one in the second. 1  The first trimester ultrasound is used by health care providers to confirm and date the pregnancy, so you will get a fairly accurate idea of your due date.