Pregnancy dating calender

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.The due date is referred to as the estimated date of confinement (EDC).This is a throwback to the days when a woman was “confined” to bed and home for a period of time after birth until convalescence was complete.FAST FORWARD The due date is called the estimated day of confinement (EDC), because traditionally women were confined to bed, “lying in,” from the day of delivery to convalescence was complete.LMP (last menstrual period) is the only observable event from which to calculate a pregnancy without the aid of ultrasound.But it’s not a due “date”, because there is too much variation in the general population.

But your due date becomes extremely important when it is used to determine the severity of preterm labor – whether your baby should be allowed to deliver with a reliable degree of safety or would another week or two guarantee mature lungs.Periods historically coming every lunar month only serve to teach us that we are so very implanted into this world, its spin, and its satellite.Over the long spans of evolution, the exact relationships have been lost, but it makes sense that the pineal gland in your head, a vestige of a third eye that in lower animals responds to light and helps with circadian rhythm and which is involved with pigmentary changes affected by estrogen and progesterone, is linked to the periodic light of the moon and the mysteriously related menses.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.

In other words, we don’t care if your baby is born at 38, 39, or 41 weeks.