Wouldn’t life be a lot less complicated if your due date would be the date you actually deliver? According to many studies, only one out of every 20 babies are born on their due date. A normal full term baby is anywhere from 38 to 42 weeks. That’s why most babies are not born on their actual due date.
The medical term for due date is EDD, which stands for Estimated Date of Delivery. When your practitioner gives you a due date, that is really only an educated guess. The way to figure out your EDD is to subtract three months from the first day of your last period, then add seven days. Or you can simply just use a due date calculator which will do the work for you.
This system works for most women who have a pretty regular menstrual cycle. But if you have a totally irregular cycle, then this system will probably not work for you. Let’s say you normally get your period every six or seven weeks but you had a strong suspicion that you’re pregnant before that. You took a test and the results came back positive! Because you need a reliable EDD you and your doctor will have to try and come up with one. Even if you’re not sure when you ovulated last, or when you conceived, there are other ways to try to figure it out.
The first way to figure it out is by checking the size of your uterus, which will be done at your
first internal examination. Your doctor will be able to tell how far along you are based on the size of your uterus. The second clue will be an ultrasound which will be able to pretty much give an accurate due date. Then, there are other clues later on during the pregnancy, like the first time the fetal heartbeat is heard, the first time you feel the baby fluttering inside of you. All these clues will be helpful in trying to figure out where you’re up to in the pregnancy. Then you can estimate your due date. Just keep in mind that none of these are definitive.