#Pregnancy due date how to
The due date may be estimated by adding 280 days ( 9. How to use the Due Date Calculator: Figure out when was the first day of your last period or the exact day you conceived. Your fundal height, which is the measurement from your pubic bone to the top of your uterus, is checked by your practitioner at each prenatal visit and helps confirm your due date. The estimated due date (EDD or EDC) is the date that spontaneous onset of labor is expected to occur. Pregnancy milestones such as the first time the baby's heartbeat is heard (around week 9 or 10, though it can vary) and when you first feel fetal movement (on average between 18 and 22 weeks, but it can be earlier or later), can give clues as to whether your due date is accurate. The World Health Organization defines a normal pregnancy term to last between 37 and 42 weeks.
Some practitioners perform them routinely, but others only recommend one if your periods are irregular, you're 35 or older, you have a history of miscarriages or pregnancy complications, or the due date can’t be determined based on your physical exam and LMP. Childbirth usually occurs approximately 38 weeks after conception, or about 40 weeks after the last menstrual period.
Unless you have been tracking your ovulation, it is very difficult to know. You calculate EDD using the first day of the last menstrual period adding exactly one year to it, add seven. Just be aware, however, that not all women get an early ultrasound. In fact, on the first day of your missed period you are already four weeks pregnant. This method is also known as Naegeles rule. Even if you can’t pinpoint when you conceived, forget the day of your last menstrual period or aren’t sure when ovulation occurred, other clues can help you and your practitioner determine your due date at your first prenatal appointment, including:Īn early ultrasound, which can more accurately date the pregnancy.
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