scottish dating traditions - Obstetric dating calculator
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A pregnancy wheel is also known as a gestation calculator.
This is the small calendar that uses your last menstrual period (LMP) to help determine your due date. Rotate the wheel by dragging and move the pointer to select LMP.
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 accuracy of the ultrasound estimate of the gestational age varies according to the gestational age.