Once you have a general idea of when you ovulated, you can use an adjusted LMP to find your due date with a pregnancy wheel.įor example, if your menstrual cycle is usually 35 days long and the first day of your LMP was November 1: If your cycle is 35 days long, for example, then you probably ovulated on day 21. This is the time from ovulation to the next menstrual period. The second half of a woman’s menstrual cycle always lasts for 14 days. In these cases, a pregnancy wheel can still be used, but some simple calculations are necessary. Some women have cycles that are consistently longer than the average 28-day cycle. What if I have irregular periods or long cycles?
The chances of actually having your baby on that exact date are very slim. Remember that the due date is only an estimate of when you will deliver your baby. When you line up that date with the indicator, the wheel displays your due date.
The first step is locating the date of your LMP on the wheel. It’s very easy to estimate your due date if you have access to a pregnancy wheel. This is the method that most doctors use. The other way to calculate your due date is to use a pregnancy wheel. In this example, the due date would be August 8, 2018. Change the year, if necessary (to the year 2018, in this case).Subtract three months (August 8, 2017).Naegele’s rule involves a simple calculation: Add seven days to the first day of your LMP and then subtract three months.įor example, if your LMP was November 1, 2017: Ultrasound can be used in conjunction with estimates based on the last menstrual period to determine a more accurate gestational age.If you have regular 28-day menstrual cycles, there are two ways to calculate your due date. It is a more accurate measure in early pregnancy than it is in later stages. Ultrasounds can be used to measure a fetus as early as five or six weeks following the mother's last menstrual period. An ultrasound used in the context of examining the progress of the fetus in pregnant women is referred to as an "obstetric ultrasound." This is done in real-time and is a fairly standard procedure that is part of prenatal care in many countries, as it can provide information about the health of the mother and embryo/fetus, as well as the overall progress and timing of the pregnancy. Based on this due date, a range of possible conception dates can be calculated.Īn ultrasound, on a basic level, uses sound waves to create images of internal body structures. In cases like these, one of the more accurate ways to estimate gestational age is through the use of an ultrasound.Īn estimated due date, usually based on a sonogram, is typically obtained from a healthcare provider during a prenatal visit. Estimating conception date can also be more difficult for women who have irregular periods, or for those who don't remember the first day of their last period. The estimation of conception date is based on this, but is rarely ever exact since it is difficult to know exactly when ovulation occurs. There are a few methods that can be used to estimate the conception dates:Ĭonception usually occurs around 11-21 days after the first day of the last period of a woman who has a regular period. This calculator helps to estimate the date range of real conception and a possible range of days during which sexual intercourse might have led to conception.
However, in reality, the baby was not conceived until ovulation and the fertilization of the egg, which usually happens at least 10 days after the first day of the mother's menstrual period.īecause there are many factors surrounding conception, it is difficult to pinpoint an exact date of conception. Often, gestational age, or the age of the baby, is calculated from the first day of the mother's last menstrual period. When exactly did I get pregnant? Many women often ask this question when trying to figure out the exact day their pregnancy began. Related Conception Calculator | Pregnancy Calculator | Due Date Calculator When Did I Conceive?
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