Your doctor may change your due date if your fetus is significantly smaller or larger than the average fetus at your particular stage of pregnancy. What does it mean if my doctor changes my due date? Some pregnancy wheels may allow you to enter the date of conception - which occurs within 72 hours of ovulation - instead of the date of your LMP. Subtract 14 days to find your adjusted LMP date (November 8).Īfter you calculate your adjusted LMP date, simply mark it on the pregnancy wheel and then look at the date where the line crosses. 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: If you have regular 28-day menstrual cycles, there are two ways to calculate your due date.
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