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This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived. This explains why pregnancies are said to last 40 weeks instead of 38 weeks. If your menstrual cycle length is the average length (28-day cycle), your menstrual cycle probably started about two weeks before you conceived. And that's how most healthcare providers do it. The most common way to calculate your pregnancy due date is by counting 40 weeks from the first day of your last menstrual period (LMP). So, without knowing the day of conception, how does anyone determine a due date? First day of your last period So, it could be up to five days after you have sex that you release an egg (ovulate) and it gets fertilized by a waiting sperm. Sperm can live for up to five days inside your fallopian tubes. Even if you only had sex once during your fertile period, you wouldn't conceive on that day unless you happen to be ovulating. (Human gestation takes about 38 weeks.)īut very few expectant moms know exactly when they conceived. If you happen to know the day you conceived, you can count 38 weeks from that day to find your due date. There are several ways your due date is determined. (2013) Human Anatomy and Physiology, 5th ed.Use our pregnancy due date calculator by plugging in either the date of your last menstrual cycle or the date you know you conceived. New England Journal of Medicine 340 (23):1796–1799Ģ) Marieb EN, Hoehn K. (1999) Time of implantation of the Conceptus and loss of pregnancy.
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Referencesġ) Wilcox AJ, Baird DD, Weinberg CR. The conception date is a date in which a sexual intercourse takes place and it is situated at a range of a few days before and after the ovulation. The date of conception depends on the female body menstrual cycle dates as the fusion between the egg and sperm can only take place when the egg is matured and released from the ovary and this only happens half way through the menstrual cycle at a date called ovulation date. This process leads to the development of an embryo that during the pregnancy, after 38 weeks time will develop into a new born ready to be birth. This is also known as fertilization or fecundation and represents the moment of fusion between the male sperm and female egg.
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The first result takes into account the length of a term pregnancy while the second result relies on the distance of 14 days between the first day of the period and the ovulation time when the baby could have been conceived. Or a pregnant woman with a cycle length of 30 days and first day of last period March 5 th 2014 is likely to have conceived March 18 th 2014. Example conception calculation and resultįor instance, someone born on January 24 th 1980 is likely to have been conceived around May 3 rd 1979. This conception calculator will only ask you to input the length of the menstrual cycle and the date of the first day of the last period in order to discover this date for you. Or if you are an expectant woman you can discover when you’ve conceived your baby based on the data of your menstrual cycle. This great tool can determine the probable conception date by using simple data from the menstrual cycle or just a simple birthday, depending on what you need to find out.įor instance if you are just wondering when you were conceived you can input your birthday and discover when is it likely that your biological parents had you. How does this conception calculator work?