Weeks Based On Due Date – Use our due date calculator by plugging in the date of your last period or the date of conception. The calculator will do the rest.
There are several ways to determine your due date. If you know the day of conception, you can count 38 weeks from that day to find your due date. (Human pregnancy lasts about 38 weeks.)
Weeks Based On Due Date
But very few mothers know exactly when they are pregnant. Even if you only have sex once during your fertile period, you cannot get pregnant if you do not ovulate on that day. Sperm can live in the fallopian tubes for up to five days. So up to five days after intercourse you release an egg (ovulation) and it is fertilized by the waiting sperm. The day you got pregnant.
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The most common way to calculate your due date is to count 40 weeks from the first day of your last menstrual period (LMP). And so do most healthcare providers.
If the length of your menstrual cycle is average (28-day cycle), your menstrual cycle will probably start two weeks before conception. This explains why pregnancy lasts 40 weeks instead of 38 weeks.
This method does not take into account how long your menstrual cycle is or if you think you are pregnant. But in general, women usually ovulate two weeks after the start of their menstrual cycle. And women are more likely to know when their last period started than when they ovulated.
Find out exactly when you are pregnant – if you use an ovulation predictor kit or follow your ovulation symptoms – you can calculate your due date based on the date of conception. Select this calculation method from the drop down menu above and enter your date.
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If you are through IVF, you can calculate your due date using the IVF transfer date. If you have an embryo transfer on day 5, count 261 days from the transfer date. If you have an embryo transfer on day 3, count 263 days.
If your baby is measured during a first-trimester ultrasound and is found to be significantly larger or smaller than expected for gestational age, your doctor may reschedule your due date. This is likely if you have an irregular length of menstrual cycle, which makes it difficult to determine the date of conception.
Your healthcare provider will measure your baby during this ultrasound to determine how far along your baby is and then give you a new due date.
If you already know your due date, you can use this calculator to see your pregnancy schedule. It will tell you when you have reached various milestones and when you should come for prenatal screenings and prenatal visits. You will also find out what your child’s birthstone and birthstone are likely to be and which famous people were born on your due date.
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Of course, the calculation of the due date is always approximate, whether it comes from our tool or from your doctor or midwife. Only 1 in 20 women will give birth on their due date. You will probably go into labor every day during the two weeks before or after.
Do you want more information on how to calculate weeks, months and trimesters of pregnancy? Check out our pregnancy time chart.
With all this talk about pregnancy dates, you may be wondering when you can take a pregnancy test. To ensure that you get the most accurate reading, it is best to wait a few days after your expected period and take a pregnancy test.
Home urine tests measure the amount of hCG (human chorionic gonadotropin) in your body. If you take a pregnancy test before your expected period, you won’t get an accurate result, even if some tests advertise it.
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If you get your blood test at your provider’s office, you can get the results sooner. These tests also measure the amount of hCG in the blood, but are more sensitive than home urine tests. Blood tests can detect pregnancy six to eight days after ovulation.
The editors are committed to providing the most helpful and authoritative information on pregnancy and parenting in the world. When creating and updating content, we rely on reliable sources: respected health organizations, professional groups of doctors and other experts, and research published in peer-reviewed journals. We believe you should always know the source of the information you are looking for. Learn more about our editorial and clinical procedures.
ACOG. 2022. Methods for estimating the expiration date. American College of Obstetricians and Gynecologists. Committee opinion. May 2017 2023]
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Do you know how to calculate your due date? Setting an accurate expiration date, also known as estimated expiration date or EDC, is very important.
If the first day of your last period is correct, you can calculate your due date by subtracting three months and adding seven days to the first day of your last period.
Your provider wants to determine your exact deadline as early as possible. The expected expiration date* affects the timing and accuracy of many medical examinations. It also affects many medical decisions during pregnancy.
* Expected expiration date is the clinical term used to determine the expiration date. This is often referred to as EDC.
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Below is a list of tests and medical decisions that may be influenced based on EDC:
To calculate the Estimated Date of Conception (EDC), you will be asked to provide details about your menstrual cycle.
If a decision is made to use your due date based on the LMP, your provider will want to know the first day of your last period and you will want to be sure of that date.
Example: If you are 10 weeks pregnant based on the LMP and your test shows that you are 16 weeks at your first prenatal visit, an ultrasound will be done to determine your due date. This is because there is a huge difference between due dates based on the menstrual cycle versus a clinical trial.
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What questions should I ask about my menstrual cycle? 1) What is the first day of your last menstrual period (LMP)?
It determines when you ovulate if you have a regular 28-day menstrual cycle. During ovulation, an egg is released from the ovarian follicle.
4. Did the last menstruation (menstrual cycle) start on the correct day and last normally?
This helps determine how reliable your period is to determine your due date. If you have fairly regular 28-day periods, you ovulate regularly in the middle of your cycle.
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Menstruation can be irregular when it starts (menarche) and when it ends (menopause). This information can also help you determine the accuracy of your last period.
7. Did you perform home pregnancy tests before this visit? If yes, what day did you first test positive?
Infertility is often associated with irregular periods, delayed ovulation, and anovulation (no ovulation). If you are in need of treatment for infertility, this information may be helpful.
11. Were you on the birth control pill or another form of hormonal contraception when you got pregnant?
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An ultrasound examination carried out at 12 weeks of pregnancy provides the most accurate information to calculate the term. This is because the ultrasound can show changes in a short period of time.
In contrast, an ultrasound performed in the third trimester of pregnancy is less accurate because the fetus is fully developed and the changes in the image are more subtle.
An ultrasound in the first trimester is the most accurate reason to calculate your due date, as there are unique ultrasound results every few days.
Below are detailed first trimester ultrasound results. They provide information on dating and fetal well-being:
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The gestational sac appears in the 4th week of pregnancy. However, it is not uncommon for it to appear between 5 and 6 weeks.
This is the first study that confirms that pregnancy develops in the womb. Often this ultrasound finding is compared to a blood test called HCG (human chorionic gonadotropin).
If the result of this blood test is more than 2500, it is concluded that there is a uterine sac.
Otherwise, it may not be a problem because laboratory measurements may vary and HCG levels may be higher than one twin has.
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The number one reason your provider wants to confirm an intrauterine pregnancy after reaching hCG 2500 is to rule out the possibility of an ectopic pregnancy.
This is a developing pregnancy, but not implanted in the uterine cavity. Ectopic pregnancies are pregnancies that implant outside the uterus. Ectopic pregnancies are very common
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