Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization. In addition, although a woman is most likely to become pregnant if she has sex on the day of ovulation conception may also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to five days before ovulation [26,27]. The due date may be estimated by adding days 9 months and 7 days to the first day of the last menstrual period LMP.
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Your due date is one of the first things that will be calculated in your prenatal care. The due date guides you and your provider in gestational age-appropriate prenatal care , testing, and ultimately your baby's birth. That's why it's important that your due date is as accurate as possible. However, it's not always straightforward. You might find yourself being told that your due date is a different date than you originally expected. Your provider will look at several factors as your pregnancy progresses to ensure that your due date continues to be accurate. Some of the factors that they will use to determine the accuracy of your due date include:.
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This Pregnancy Test calculator helps you estimate the best date when to take a pregnancy test, so that it is as accurate as possible. Even though fertility and pregnancy are very complex subjects, dependent on many variables, it is possible to calculate how early you can take a pregnancy test to expect an accurate result. It doesn't matter if you don't know the day you conceived - if you are wondering when is the best time to take a pregnancy test, try our easy-to-use calculator!
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. So if your last period started on April 11, you'd count back three months to January 11 and then add seven days, which means your due date would be January