Your due date is just a good guess — but it's helpful. So is knowing about pregnancy trimesters and how to translate weeks to months in pregnancy. Our pregnancy weeks and months chart will help! To determine your due date, healthcare providers count 40 weeks from the first day of your last menstrual period LMP rather than trying to guess exactly when sperm met egg.
Visit our Pregnancy Due Date Calculator to check how many weeks pregnant you are. Healthcare providers use your LMP to date pregnancy because many women don't know which day they ovulated. And even if you know the day you had sex that resulted in pregnancy, that may not be the day you conceived : Sperm can linger in your uterus for up to five days waiting for an egg to be released so they can fertilize it.
Using your LMP to find your due date means that when you get confirmation that you're pregnant, you'll most likely be 4 or 5 weeks along. There are 40 weeks in a pregnancy — though you're just as likely to deliver your baby a few weeks before or after that. Each trimester is 13 or 14 weeks long. The first trimester lasts until you're 13 weeks pregnant, the second trimester spans week 14 to week 27, and the third trimester starts the day you turn 28 weeks pregnant and lasts until week 40 or until you deliver your baby.
There are three trimesters: the first trimester early pregnancy , the second trimester mid-pregnancy , and third trimester late pregnancy. Check out our chart to see how the weeks, months, and trimesters of pregnancy line up with each other. You can use the chart above to figure out how the weeks of pregnancy correspond to months. Note that you're not technically one month pregnant until after 4 weeks have passed, for example.
But you are "in your first month" during the first 4 weeks and "in month nine" during the last 4 weeks. Actually, in a typical year, February is the only month that's four weeks or 28 days long. All others are either 30 or 31 days. On average, a month is 4. And that's why some months in the chart are four weeks long and some are five weeks long. Forty weeks is actually a little more than 9 months. For example, if your last period started on January 1, your due date would be October 8.
So that's more like nine months and one week or even longer if you go past your due date. University of New South Wales Embryology. Evaluation of gestation. The pregnancy dating scan. You and your baby at 1 to 3 weeks pregnant. You and your baby at 38 weeks pregnant.
You and your baby at 40 weeks pregnant. NHS maternity statistics, Antenatal care for uncomplicated pregnancies. International standards for early fetal size and pregnancy dating based on ultrasound measurement of crown-rump length in the first trimester of pregnancy. Ultrasound Obstet Gynecol 44 6 Show references Hide references. Enter your due date or child's birthday dd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec yyyy Trying to conceive?
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See all in Pregnancy. You'll also find important medical info that will help keep you and your baby healthy. After you announce your pregnancy, the first question you'll probably be asked is "When are you due? It's important to remember that your due date is only an estimate — most babies are born between 38 and 42 weeks from the first day of their mom's LMP and only a small percentage of women actually deliver on their due date.
Another common term you'll hear throughout your pregnancy is trimester. A pregnancy is divided into trimesters:.
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