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But since no one is pregnant before conception, this is a source of confusion on every pregnancy until the way we count is explained. Divided into perfect four-week months, this comes out to ten perfect months.But Julius Caesar and Pope Gregory XIII, the architects of the modern calendar, were thinking of anything but gestation when, as the sing-song goes, “Thirty days hath September, April, June, and November.” (It goes without saying that all the rest but one have thirty-one….) If an obstetrician had designed the calendar, every month would have 28 days (“and no more”), comprising 13 perfect four-week months per year.Actually, this “OB” year would be just a little short, the real solar year being 13 perfect months and about one and a quarter day.I know I could figure out something to do with that extra one day, five hours and forty-nine minutes.
But we surely need to know when 40 weeks is so that we can be correct in stopping your labor at 33 weeks.The forty weeks of pregnancy take up nine months according to the Gregorian calendar.It is no coincidence that the average menstrual cycle lasts twenty-eight days.According to the usual way pregnancy is calculated, you are considered four weeks pregnant.At least we obstetricians call it four weeks, because we count from the last regular menstrual period.