Accurate 10 week dating scan
Traditionally the last menstrual period has been used to date a pregnancy, but this may be highly inaccurate.
A simple formula is to take the first day of the menstrual period, subtract three months and add one week.
For instance a dating scan done at 6 weeks could get the date wrong five days either way.
A scan at 12 weeks could get the date wrong seven days either way and a scan done at 20 weeks could get the date wrong up to ten days either way.
I didn't think anything of it, because I am almost 38, and this has never happened to me before.
So, my question is, when I went to have my ultrasound, the sonographer did 2 measurements for the conception date: one was 6 weeks and 3 days, and the other one (just to be sure) was 6 weeks 5 days.
A vaginal scan is done by introducing a probe into your vagina. Abdominal scan After 10 weeks and for the rest of your pregnancy, you will have an abdominal scan.
Due to having wavering periods, I never really keep track, and therefore I don't know when my last period was.Dating a pregnancy accurately at the earliest possible time is important.In a normal pregnancy it does not matter what the dates are, but if anything should go wrong it becomes very important as to what treatments may be prescribed.There are two ways of doing a first trimester scan: Transvaginal scan (TVS) If your doctor wants you to have a scan earlier than 10 weeks of pregnancy, you will have a transvaginal scan.In these early weeks of pregnancy, your baby is too small and low in your abdomen to be picked up by an abdominal ultrasound scan.