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Pregnancy conception dating

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

However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment.

Usually the expected date of delivery (EDD or EDC) is calculated from your last menstrual period - if the early dating scan calculates the EDD to be within 5 days of the EDD from your last menstrual period.

The menstrual cycle is counted from the first day of a woman's period (day one).