I first heard of counting a pregnancy in weeks at my very first OB appointment. But no matter how many times I tried to add up the months of pregnancy, it didn’t work. There were way too many weeks to cram into nine months. Despite the fact that I married a mathematician, math is not my favorite subject, though I quickly saw the benefit of calculating the weeks of pregnancy based on a single date, like the last menstrual period (LMP), to help make a universal time line for all women.
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