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5 ½ weeks gestation means 5 ½ weeks from the first day of the last menstrual period, which is usually about 3 ½ weeks from the date of conception (confusing, isn’t it!
The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date.
All information contained in and produced by the Med Calc 3000 system is provided for educational purposes only.
This information should not be used for the diagnosis or treatment of any health problem or disease.
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.