Dating your pregnancy from conception

In other words, you have a six-day window where you could potentially get pregnant each month.

Calculating Conception - American Pregnancy Association

Do you already know your due date but want to know when you likely conceived? Try our reverse due date calculator. This figure is based on how the baby is measuring, not on your LMP, which the due date calculator uses. If there are significant differences in the dates, your doctor may want to dig deeper to determine conception date.

Calculating Conception Date

As a result, your midwife or doctor may change your due date based on the ultrasound gestational age. The 40 weeks of pregnancy begin on the first day of your last menstrual period.


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The table below shows the average age of infants delivered in the United States according to the number of fetuses being carried plurality [29]. The earlier age at delivery of multiple gestations is a reflection of the increased incidence of preterm labor and obstetric intervention for complications such as preeclampsia, abruptio placentae, fetal growth restriction, and increased risk for stillbirth that occurs as the number of fetuses increases [].

Conception date

The tendency for multiple gestations to be delivered earlier than singleton pregnancies should not be interpreted that multiples should be assigned an earlier estimated due date. How accurate is fetal biometry in the assessment of fetal age?. Am J Obstet Gynecol ; Estimating the date of confinement: Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. Clinical management guidelines for obstetricians-gynecologists.

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Number 55, September replaces practice pattern number 6, October Management of Postterm Pregnancy. The validity of gestational age estimation by menstrual dating in term, preterm and postterm gestations. Am J Obstet Gynecol. Birth weight from pregnancies dated by ultrasonography in a multicultural British population. Sep 4 ; American College of Obstetricians and Gynecologists. Conceptional age, menstrual age, and ultrasound age: Emerg Med Clin North Am. Hay DL, Lopata A.

Chorionic gonadotropin secretion by human embryos in vitro. J Clin Endocrinol Metab.

Best time & dates to get pregnant

Wilcox AJ, et al. Time of implantation of the conceptus and loss of pregnancy. N Engl J Med. Lohstroh P, et al.

Pregnancy Due Date Calculator

Daily immunoactive and bioactive human chorionic gonadotropin profiles in periimplantation urine samples. We have studied patients in a consecutive fashion who have been charting the CrMS at the time of conception. In this group of patients, early ultrasound dating of the pregnancy was also obtained. In Table , the results of that evaluation are shown. An accurate date for the beginning of pregnancy can be established with the use of the CrMS. This correlates well with the ultrasound dates and the estimated due date or ETA. In fact, the CrMS dating correlated, on average, in the following way: The CrMS dates were highly accurate with the two being within 10 days of each other in percent of the cases.

An example of this dating is shown in Figure Here, a pregnancy occurring in a longer cycle where the Peak Day occurred on Day 26 of the cycle is shown. If this pregnancy is calculated in the traditional fashion, there will be a day discrepancy between the dates as customarily calculated from the last menstrual period and the actual date of the pregnancy which is calculated from the Peak Day. The Peak Day, of course, will be much more accurate.