Early ultrasound weeks off dating
This results in a calculation of 40 weeks for the entire pregnancy, even though pregnancy generally lasts about 38 weeks from the time of conception.
The moment of conception is technically when you first became pregnant, but obstetricians don't calculate the age of your baby this way.
research any test before deciding whether to use it or not. For more information on prenatal testing, see the FAQs available from info on the Internet.
Testing decisions vary greatly depending on family history, medical condition, parental beliefs, etc.
Ultrasound scans use sound waves to build a picture of the baby in the womb.