First, determine the first day of your last menstrual period.There are online calculators that allow you to answer various questions, and the more information you input, the more accurate your estimated due date will be.Ī 1990 study by researchers Robert Mittendorf and Michelle Williams indicated that a first pregnancy lasts about 288 days from your LMP, but subsequent pregnancies last about 283 days from your LMP. The Mittendorf-Williams rule is considered highly accurate because it takes more information into account to calculate your due date. Then add one year and seven days for a due date of August 8, 2022.
Lastly, add one year and seven days to that date.įor example, if your LMP was November 1, 2021, you would subtract three months to August 1, 2021.Then, subtract three calendar months from that date.First, determine the first day of your last menstrual period (LMP).Naegele’s rule is a standard formula to use if your menstrual cycle is a regular 28-day cycle with ovulation occurring on about day 14. You can also use several due date formulas to calculate an estimated due date until you can get an accurate date by ultrasound. Various Ways You Can Calculate Your Due DateĪccording to the American College of Obstetricians and Gynecologists (ACOG), the most accurate way to determine your due date is by ultrasound in the first trimester of pregnancy. īut here’s the catch - remember how we discussed that the egg could live for 24 hours and sperm can live up to five days? That means you can’t calculate your conception date as the day you had unprotected sex because you may have conceived several days after that. The average gestation for humans is about 266 days from conception, so you can add 266 days to your conception date to get your approximate due date. This can be pinpointed with the greatest accuracy if you only had unprotected sex once during your cycle and with certainty if you became pregnant by in-vitro fertilization, for example. Sometimes, women know approximately the date they conceived, also known as the conception date. Also, keep in mind that you can get pregnant while you’re breastfeeding, using birth control, or having vaginal bleeding.
Remember that hormones cause your sex drive to be at its highest while you’re ovulating. This means there can be as long as six days in the middle of your cycle that you can become pregnant. Once you ovulate, an egg can survive up to 24 hours, and sperm can live in your body for up to five days. So you might be wondering how many days during your cycle there is a possibility of becoming pregnant. Īs you can see, conception occurs when a sperm fertilizes an egg during the second half of your cycle, in the luteal phase. If sperm is already present in the fallopian tube or becomes present within 12-24 hours, the egg can be fertilized, marking the moment when conception occurs. At the same time, hormones prepare your uterus lining for a fertilized egg to implant. The released egg travels through the fallopian tube to the uterus during this phase. Luteal Phase: The luteal phase is the second half of your cycle and ends when your next period starts.The egg can survive and be fertilized by sperm for up to 24 hours. It marks the point when a mature egg is released from your ovary. Ovulatory Phase: The ovulatory phase divides your cycle’s first half (follicular phase) and second (luteal phase).Hormones cause your ovary to get eggs mature for and ready ovulation. Follicular Phase: The follicular phase begins on the first day of your period and lasts throughout the first half of your cycle.Menstrual Phase: You have your period during the menstrual phase.Your cycle has four phases: menstrual, follicular, ovulatory, and luteal. This is a hormonal process referred to as your menstrual cycle or “cycle’, and it starts on the first day you get your period and ends on the day before your next period.Ī typical menstrual cycle lasts anywhere from 21 to 35 days, but the average length is 28 days. Understanding Your Cycle and ConceptionĮach month, your body prepares for a possible pregnancy.
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In this article, we’ll discuss pregnancy and how to determine your estimated due date. When you tell people you’re pregnant, what is the first question they usually ask? It’s typically, “When are you due?” It’s like that was also among the top questions you asked yourself after learning you were pregnant.
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