Sometimes a trans-vaginal examination shows that your pregnancy is less advanced than expected.

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Most dating scans are done with a trans-abdominal transducer and a fullish bladder.

If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.

the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination.

This is presuming that the pregnancy is actually at this stage of development.

For transvaginal ultrasound you can have an empty bladder Dating scans are usually recommended if there is doubt about the validity of the last menstrual period.

For example if you a tiny sac can be seen in the uterus, but the baby and its heart beat may not be detected yet.

The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.

As the baby gets bigger, it starts to express its individual growth potential.

If you have any questions about this, please feel free to talk to your sonographer or doctor about it.