![]() The sound waves are converted by a computer into a picture of the fetus. The transducer sends out sound waves that bounce off the fetus. footnote 2 Some doctors always do an ultrasound in early pregnancy.ĭuring an ultrasound test, a small device called a transducer is moved back and forth over your belly. If youre not aware of the conception date, your due date is calculated on the. Ultrasound tests work well to find out how long you have been pregnant, especially if they are done before 20 weeks of pregnancy. The first and the most simple way is to enter the confirmed conception date. If the first two methods can't predict your due date, you may get an ultrasound. For example, the fetus may be in an odd position. That's because there are many things that can make the fundus seem higher or lower than it really is. But it's not an accurate way to predict the gestational age of the growing baby (fetus). The size of the uterus is sometimes used to get a rough idea of how far along a pregnancy is. At 20 weeks, the fundus will be about as high as your belly button. After about 18 weeks, the distance between the pubic bone and the fundus (in centimetres) is likely to be about the same as the number of weeks since your last period. When you are about 12 weeks pregnant, your doctor or midwife can feel the top of the uterus (fundus) above your pelvis. Interactive Tool: What Is Your Due Date?Īnother way to find out your due date is by the size of your uterus.Then subtract 3 months to get a due date of December 27.Īnother way to estimate your due date is to add 40 weeks to the first day of your last period. For example, if your last period started on March 20, you would add 7 days to get March 27. Add 7 days, and then count backward 3 months. ![]() ![]() ![]() The most common way to calculate your due date is to start with the first day of your last menstrual period (LMP). Ask you about the first day of your last period.To find out how long you've been pregnant and when your baby is due, your doctor or midwife may: Most women deliver within 14 days of their due date. The due date is only an estimate of when your baby will be born. They help you predict when you are likely to have your baby. There are several ways for your doctor or midwife to figure out how long you have been pregnant. ![]()
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