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On pregnancy, why the date of conception is said to be the 15th day since LMP?

April 26, 2017conception lmp pregnancy said

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On pregnancy, why the date of conception is said to be the 15th day since LMP?

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Every reference to the term of pregnancy in books or ultrasound or anywhere, is based on the term from the last menstrual period (LMP). That’s why we display the term in the same scale.