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Some women will deliver on their due date, others before, and others after.
We luckily “caught the first egg” in both cases, so I had no last menstrual period to use in calculating a due date.But there can be other issues at play, such as when a woman has had sex with two men since her last menstrual period, for instance. Or perhaps she had irregular cycles and needs to pinpoint a more specific date in a timeline to accurately plan for the baby's birth. Using a calendar type system, you figure a due date by adding 280 days to last menstrual period, or equaling 40 weeks. That way, regardless of where they trained or where they practice, any two doctors dating a pregnancy will predict the same due date or gestational age.However, the timing of the actual delivery is not so predictable.