![]() 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. We have created a slew of pregnancy calculators and tools to help you through your pregnancy.To track pregnancy and calculate a due date, doctors use gestational age. Pregnancy Calendarįollow your baby's development week by week in our article series. If you want to, you can view a sample due date report. ![]() Timeline of Significant Milestones in Embryo/Fetal Development.Due Dates for Multiples (Twins, Triplets, Quads).Each due date report contains the following data: A normal pregnancy can last anywhere between 38 and 42 weeks. Most are born within a week either side of the estimated due date. On average only 5% of births take place exactly on the estimated due date. Be sure to talk to your health care provider about your due date. Every pregnancy is unique and your baby will come when it's ready. Please remember that your due date is only an estimate. If you deliver on your due date, your baby is actually only 38 weeks old, not 40. Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy. Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Pregnancy induced hypertension How is my due date calculated?
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