Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well.
Then at the week scan I got an EDD of 15 march, so that early scan was completely out.
As such, transvaginal ultrasounds reveal the shape of the cervix which indicates whether the process of confinement has started.
All pregnant you will be offered another blood test between 18 to 20 pm.
Description: WTE Must Reads. Ultrasound dating at 12—14 weeks of gestation.