As pregnancy progresses, the accuracy of an ultrasound for predicting due dates decreases. Between 18 and 28 weeks of gestation, the margin of error increases to plus or minus two weeks. After 28 weeks, the ultrasound may be off by three weeks or more in predicting a due date.

Can ultrasound detect wrong due date?

After 20 weeks of pregnancy, your estimated due date shouldnt change based on an ultrasound because it will be less accurate. And remember: Its an estimated due date; the vast majority of women dont deliver their babies the day theyre due.

How often are doctors wrong about due dates?

Share All sharing options for: Doctors get due dates wrong 96.6 percent of the time. If and when you happen to get pregnant, your doctor will likely give you a date for when to expect your newborn to arrive.

What are the chances of due date being wrong?

More than 90% are born two weeks either side of the predicted date. But, as noted above, only 4% (or 4.4%, ignoring pregnancies with complications etc) are born on the predicted date itself - in other words, the chance of this happening is less than one in 20.

What week is OK to give birth?

In general, infants that are born very early are not considered to be viable until after 24 weeks gestation. This means that if you give birth to an infant before they are 24 weeks old, their chance of surviving is usually less than 50 percent. Some infants are born before 24 weeks gestation and do survive.

Do girl babies come earlier?

Girl babies are more likely to be born earlier than boys. Also, if you have longer menstrual cycles, youre more likely to deliver your baby after your due date – but you can never know for certain ahead of time.