I then compare that date to the result I would get from just using the LMP. “On ultrasound, I would measure the length of the fetus, called the ‘crown–rump length,’ in the first trimester to get the gestational age or due date. “The LMP is compared to an ultrasound because some women have irregular cycles, so their LMP is not the most accurate,” Dr. This is especially important if your period doesn’t always arrive at the same time each month. But an ultrasound scan in the first trimester is used to check that the dating based on the last menstrual period is correct. How to calculate due date: Ultrasound scanĪs you’ve seen above, there are numerous ways to calculate an estimated due date - most involving the date your last period started. Your health care provider will usually calculate your due date based on one or a combination of the following methods, so let’s find out more about how they work.
Learn more about how you count pregnancy weeks here. Pregnancy is counted in complete weeks, so 13/5, 13+5, or a variation of this would mean you’re 13 weeks and 5 days pregnant. You might also see figures like 13/5 or 13+5 in your doctor notes.
Also, this method recognizes that not all months have the same number of days, so you’ll likely still be pregnant at nine months. So that means you count pregnancy from your LMP, not the date you conceived, adding an extra two weeks even though you weren’t technically pregnant then. That’s to account for the fact that pregnancy is measured according to gestational age, not fetal age. And your baby’s estimated due date falls on the 40th week, when you’ll actually be around 10 months pregnant. In fact, the first thing you’ll likely notice when you let your health care provider know you are pregnant is that pregnancy is calculated in weeks rather than months. But some women can go beyond that to 41 weeks.” “The due date is 40 weeks from the first day of your last menstrual period. Charlsie Celestine, Flo board member, obstetrician, and gynecologist (OB-GYN), explains. “The nine months of a pregnancy are actually 40 weeks,” Dr. To work out how to calculate pregnancy weeks, there’s a little more to it. Lots of us assume that a pregnancy is exactly nine months long, but that’s not the case. However, this is a far less common measurement for pregnancy because it’s often hard to pinpoint exactly when you ovulated (and therefore the moment of conception). To calculate this, you work out the amount of time from the date of conception (which is around two weeks later than your LMP in a 28-day cycle but varies depending on cycle length) to the current date in weeks.
While gestational age measures how far along a pregnancy is in weeks, fetal age is the actual age of the growing baby. The other method of measurement is fetal age. If a baby is born before 37 weeks, they are considered premature. In general, pregnancies last anywhere from 38 to 42 weeks (or around 280 days). Gestation is how long a person is pregnant in weeks, and gestational age is measured from the last menstrual period (LMP) - the first day of your last period - to the current date in weeks. To track pregnancy and calculate a due date, doctors use gestational age.
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