At this time, the fetus is a little larger and easier to measure. 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 early ultrasound dating be wrong?

3 Early ultrasound due dates have a margin of error of roughly 1.2 weeks. 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 accurate are early dating scans?

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 dating scans be inaccurate?

Its possible, that the dating of the pregnancy is off, and youre not nearly as far along as you thought. In such case, the doctor or midwife may order another ultrasound in a week. In the end, the pregnancy could be just fine, and all that is really needed a simple recalibration of the date.

Is it normal to have a bump at 7 weeks pregnant?

Its unlikely that youll have a baby bump at seven weeks, but your body is changing even at this early stage. Your stomach muscles are continuing to relax and your uterus is expanding. By week seven its said to be about the size of a lemon and will continue to grow to cater to your growing baby.