This is a scan done early in pregnancy before 12 weeks of gestation. the pregnancy in number of weeks and therefore establishes a more accurate estimated date of delivery. Fetal limb buds are seen at 9-10 weeks with body movements.
Early pregnancy roughly spans the first ten weeks of the first trimester. 8-9 weeks The earlier in pregnancy a scan is performed, the more accurate the age Overall, the accuracy of sonographic dating in the first trimester is ~5 days (95%