Dating conception pregnancy

This method of calculation may be more accurate than a LMP due date calculation if you have irregular or consistently longer or shorter cycles than 28 days.

Fertilization (Conception)

The date of conception is the day that the egg and sperm meet. Women who track their ovulation may know their exact date of conception. But for many women, date of conception can be tricky to pinpoint. In other words, you have a six-day window where you could potentially get pregnant each month. Do you already know your due date but want to know when you likely conceived?

Calculating Conception

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.


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If there are significant differences in the dates, your doctor may want to dig deeper to determine 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. Your fundal height, which is the measurement from your pubic bone to the top of your uterus, is checked by your practitioner at each prenatal visit and helps confirm your due date. Whether you're trying to avoid being very pregnant in the middle of summer or are a teacher who wants to maximize time off with your little one, you can try to time when you conceive in order to "plan" your due date.


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But even if you're one of the lucky ones who's able to get pregnant when she really wants to, just remember that you probably won't be able to map out exactly when you'll give birth to the day or even the week or month! It may be that your periods are irregular and your early ultrasound dating was off, or that your first ultrasound was in the second trimester. Talk to your practitioner if you have any questions or concerns.

Pregnancy Conception Calculator

The educational health content on What To Expect is reviewed by our team of experts to be up-to-date and in line with the latest evidence-based medical information and accepted health guidelines, including the medically reviewed What to Expect books by Heidi Murkoff. This site complies with the HONcode standard for trustworthy health information. This educational content is not medical or diagnostic advice. Use of this site is subject to our terms of use and privacy policy.

Pregnancy Due Date Calculator: How Many Weeks Pregnant Am I? | What to Expect

Due Date Calculator Choose from a variety of ways to predict your due date. The first day of your last period. Find Your Due Date.

Calculating Gestational Age

First day of last period 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. Conception date Calculating your due date based on the first day of your last period works well for women who have a relatively regular menstrual cycle.