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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.
If ultrasound is performed in the first trimester, it can indicate fetal age within a range of 3 5 days. Later in pregnancy, it is less accurate. Up to 20 weeks, the margin of error is 7 10 days. By the third trimester, an ultrasound date can be off by as much as 3 weeks in either direction.