However, the timing of the actual delivery is not so predictable.
Some women will deliver on their due date, others before, and others after.
Instead, we most commonly date pregnancies from the first day of the last menstrual period (LMP).
One reason for not dating pregnancies from the day of conception is that we cannot know that day exactly (excluding cases of assisted reproduction), but we can know the first day of LMP, based on what a patient reports to us.
But a physical exam can be misleading (due to factors such as twins, uterine tumors, or obesity) and is not used as the main way to date a pregnancy if LMP or ultrasound is available.
The average time between menstrual periods is about 28 days, and ovulation occurs about 14 days before the next period begins.
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HIDDEN FIGURES is the incredible untold story of Katherine G. Henson), Dorothy Vaughan (Octavia Spencer) and Mary Jackson (Janelle Monáe)-brilliant African-American women working at NASA, who served as the brains behind one of the greatest operations in history: the launch of astronaut John Glenn into orbit, a stunning achievement that restored the nation's confidence, turned around the Space Race, and galvanized the world.
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