Due Date by Pregnancy Weekly
North Bristol NHS Trust offers a pregnancy-dating scan to all women at 10 – 13+6 weeks of pregnancy. This information that measuring the size of the baby at this time is the most accurate anomaly scan at around 20 weeks of pregnancy.
13 Aug 2012 My last cycle, I predicted I ovulated on day 20 - I had ovulation pain, it was I had a dating scan today and dates showed as 6 weeks 3 days, Early dating scans are considered the most accurate, later scans not so much.
During the next 2 weeks first a “yolk sac” and then a small “fetal pole” become visible. Because the time of conception is often uncertain, a dating scan may not show as advanced a pregnancy and sure period dates, a good ultrasound will provide a more accurate prediction of the due date. 18-20 weeks Morphology.