If your first ultrasound gives you a due date that is more than 1. Ultrasound is painless and risk-free, and seeing the baby on the screen is also an enjoyable experience. The ultrasound report includes measurements of the abdomen, head, and thighs, and amniotic fluid. The sonographer then said that I was only about 4. Ultrasound examinations from 12 to 22 weeks are regarded as being within 10 days of accuracy or up to 10 days earlier or 10 days later than the woman's calculated due date. Was this page helpful?
Can your pregnancy scan give the wrong due date?
Just how accurate are the due dates that are predicted by an ultrasound? Also, the changes that start happening in the cervix are internal and not external. Sometimes a trans-vaginal examination shows that your pregnancy is less advanced than expected. Was this page helpful? The sonographer then said that I was only about 4. The accuracy of determining the due date using LMP depends on regular cycles. It mostly occurs in the first trimester in most cases where the dates differ by more than a week.