Using the date of your last menstrual period (LMP) This tool will help you determine the exact number of weeks that have passed since conception.įollow our easy guide using either your LMP or conception date. Using a due date calculator : step by step guideĭiscovering the number of weeks you are pregnant is as simple as working out your gestational age using the pregnancy calculator. How does a due date calculator work?ĭue date calculations are easy in principle, but it can be tricky to keep count of all those months and days into the future, which is why a due date calculator is such a handy tool.Ī due date calculator simply does the maths for you by adding 280 days from the first day of your last period (or 266 days from your conception date), giving you a probable date for your baby’s arrival. The easiest way is to use the due date calculator with your LMP, conception, or ultrasound date. Your 12-week ultrasound scan (5) is also known as your dating scan and the measurements your sonographer takes can give you a fairly accurate EDD.To work out your EDD, use the LMP date and count forwards by 280 days.Pinpoint the first day of your LMP and count forwards to today’s date - that tells you how many weeks and days into your pregnancy you are.There are a few ways to date a pregnancy, including: The gestational age of your baby is always around two weeks more than their foetal age, as they’ve only existed since a day or so after ovulation. Making sure that they’re at the right times to check your baby’s development. It’s important for helping your antenatal care team schedule your upcoming scans, tests and midwife appointments. Your baby’s gestational age is determined by the date of your LMP. Then, you can use the due date calculator to help you determine the exact number of weeks that have passed since conception. Even though the foetal age (4) of the baby is two weeks, you’re four weeks pregnant by gestational age. Suppose you get a positive pregnancy test on the day your period is due. To work out how many weeks pregnant you are, count the first day of your last menstrual period as the start of the pregnancy. How long pregnancy lasts (3) is around 40 weeks, or 280 days, so by using your LMP as a starting point, you can work out when the baby might arrive. The first day of a period is a definite point in time which gives your doctor, you and our calculator something to work from.įor example, if your last period started on January 1, your EDD would be October 8. Also known as the estimated due date (EDD), your antenatal team will calculate this timing from the date of the first day of your last menstrual period (LMP) (2). What is a due date?Ī due date, in pregnancy, is the date the baby is expected to be born. Knowing your due date is also important on a personal level, because it helps you to plan ahead and get everything you need in place for your baby and for your new life as a parent. Your due date is very important for you and your healthcare team as it determines the course of your antenatal care (1), including prenatal tests and midwife appointments.
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