Last week my husband and I went in for our dating ultrasound. During the ultrasound, they measure the amniotic sac and the baby to verify how far along you are and give you a precise due date. They prefer not to go just by the last menstrual period date. Also no one really knows when you ovulated, so it gives the doctors an accurate time frame. The technician that did the ultrasound also explained how important the date is, because most women need some medical treatment or testing through their pregnancy. The doctor wants to make sure they are not doing it too early or too late.
