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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.
Bear in mind that you may need a second ultrasound before you know for certain if all is well. If you are unsure of the first day of your last period you will be offered a dating ultrasound when you are between 10 and 14 weeks pregnant (SOGC 2003) . The main reason for the ultrasound is to work out how many weeks pregnant you are, and to estimate your due date.