The dating scan is an ultrasound scan that can be done as early as six weeks after the last period, but the dating scan will be most accurate when done between 8 and 12 weeks gestation.

Can a dating scan be 3 weeks wrong?

How accurate is the ultrasound examination? The earlier the ultrasound is done, the more accurate it is at estimating the babys due date. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy. The most accurate time is between 8 and 11 weeks gestation.

Can two weeks pregnancy show in scan?

For the first two weeks after a missed period early pregnancy appears on the scan as a small fluid filled bubble as the embryo (future baby) is too small to be seen yet.