How accurate is a due date that is determined by ultrasound?

Описание: You mentioned that you're about 24 weeks along, you had an early ultrasound when you were 6 weeks, and you weren't sure when your last period was. And that's probably why the doctor did an ultrasound, because there's 2 ways to figure out how far along a woman is. One is going off her previous cycle history. If a woman has had a history of regular periods, then they'll ask you what your last period date was. And if you're sure about it, then it's pretty easy to figure out how far along you are. But if a woman has irregular periods or you don't know when your period was, then an ultrasound is the best way to date your pregnancy. A fetus will grow at a pretty consistent rate during the first trimester, and so when they did the ultrasound at 6 weeks and figured that your baby was 6 weeks along, that's the best and most accurate thing that we can go by. In fact, if a baby starts to be either larger or smaller than they should be in the 2nd or 3rd trimester, a lot of times we ask, "Did she have an early ultrasound?", because that's the best way to figure out if our due dates are accurate. So because your due date was based on an early ultrasound, you can say that it's really accurate - as accurate as we can get.

So you also had some questions about the extra weeks added on at the beginning of a pregnancy when you weren't actually pregnant. And this does get pretty confusing for a lot of people. So conception happens at the time you ovulate, when sperm an egg meet up. And ovulation usually happens about mid-cycle, or about 2 weeks after your period started. You won't find out you're pregnant until the time of your missed period, or 2 weeks after conception, but at that point, you're considered to be 4 weeks along. It's been 4 weeks since your last period, but the baby has actually only been growing for 2 weeks. So that's where it gets confusing. So the first week of the 40 week gestational period is actually the first week when you were having your period in the cycle that you actually got pregnant in. So that's all a little bit confusing, but just go with it since your doctor gave you an accurate due date based on an early ultrasound. Then you can pretty much say, "Yep, I'm due on October 21st. I sincerely hope the best for you during your pregnancy, and if you have any other questions for me in the future, feel free to ask them on our Facebook page at   / intermountainmoms  , and recommend us to your friends and family too.