Even dating scans can be inaccurate for the due date, but they are never as inaccurate as using the menstrual period. For instance a dating scan done at 6 weeks could get the date wrong five days either way.

Can a dating scan be wrong by 5 days?

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 sonographer get dates wrong?

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.

How can I be sure Im not pregnant?

Symptoms of False PregnancyInterruption of the menstrual period.Swollen belly.Enlarged and tender breasts, changes in the nipples, and possibly milk production.Feeling of fetal movements.Nausea and vomiting.Weight gain.12 Jun 2020