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Pregnancy lasts an average of days 40 weeks from the first day of your last menstrual period LMP. Read our report on the 13 best pregnancy iPhone and Android apps of the year here. If you have regular day menstrual cycles, there are two ways to calculate your due date. The other way to calculate your due date is to use a pregnancy wheel. This is the method that most doctors use. The first step is locating the date of your LMP on the wheel. When you line up that date with the indicator, the wheel displays your due date.

Dating due date pregnancy

Average Length of Cycle 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 days default Average Luteal Phase Length 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 days default Race Caucasian Non-Caucasian. Pre-pregnancy height ft in cm switch to metric. Pre-pregnancy weight lbs kg.

Higher education No Yes. Alcohol during pregnancy No Yes.

How to Calculate Your Due Date

Incompetent cervix No Yes. First pregnancy No Yes.

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DES exposure in cervix No Yes. History of miscarriage No Yes. History of stillbirth No Yes.

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Your healthcare provider might revise your due date if your baby is measured during a first trimester ultrasound and found to be much bigger or smaller than expected. This is more likely to happen if you have an irregular cycle that makes it hard to pinpoint the date of conception.

Your due date is just an estimate.

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Only 1 in 20 women delivers on her due date. You're just as likely to give birth within the two weeks before or after. Pregnancy by weeks, months, and trimesters.

Med. Calc: Pregnancy Due-Dates Calculator Last menstrual period: Conception Occurred: (about two weeks after last menstrual period) First Trimester Ends (12 weeks): Second Trimester Ends (27 weeks): Estimated Due Date (40 weeks): On, you will be weeks pregnant. Created: Saturday, January 15, The other way to calculate your due date is to use a pregnancy wheel. This is the method that most doctors use. It's very easy to estimate your due date if you have access to a pregnancy The Healthline Editorial Team. Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy. If you deliver on your due date, your baby is actually only 38 weeks old, not Your due date is only an estimate. Please remember that your due date is only an estimate. Every pregnancy is unique and your baby will come when it's ready.

Join now to personalize. Choose a calculation method Last period Conception date I know my due date. First day of my last period. See your timeline.

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Medically reviewed by Sally Urang, R. Show sources ACOG.

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Methods for Estimating the Due date. J Perinat Educ. Length of human pregnancy and contributors to its natural variation. Hum Reprod.

How to Calculate Your Due Date by Ultrasound (Week 6-2)

Your Pregnancy Week by Week. Overview First Trimester. Second Trimester.

Pregnancy Calculator. From first day of your period to the first day of your next period. Ranges from: 22 to Default = 28 Optional: Leave 28 if unsure. Jan 23,   The most common way to calculate your due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that's how most healthcare providers do it. This method is based on the idea that women typically ovulate about 2 weeks after their period starts and pregnancy typically lasts about 38 weeks.

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Article Sources. Verywell Family uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles.

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Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Ananth, Cande V.

Your due date is one of the first things calculated in your prenatal care. The due date is something that will help guide both you and your practitioner for gestational age-appropriate prenatal care, testing, and ultimately your baby's birth. It is, therefore, very important to ensure that you have the most accurate due date possible. Jan 07,   Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or days, from the first day of your last menstrual period (LMP). Another way to do it is to subtract three months from the first day of your last period and add seven days. The due date may be estimated by adding days (9 months and 7 days) to the first day of the last menstrual period (LMP). This is the method used by "pregnancy wheels". The accuracy of the EDD derived by this method depends on accurate recall by the mother, assumes regular 28 day cycles.

Menstrual versus clinical estimate of gestational age dating in the United States: temporal trends and variability in indices of perinatal outcomes. Paediatric and Perinatal Epidemiology, 21, New York: Childbirth Connection, May Obstetrics: Normal and Problem Pregnancies 5th ed.

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  1. Vokree

    It is difficult to tell.


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