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The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age.
"Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age" .
Due dates are determined based on a number of factors, including your menstrual cycles and the baby's measurements, which can predict your baby's expected date of delivery within a week or two. Drai Due dates are accurate if you have regular monthly periods; obstetricians often calculate the due date based on the first day of a woman's last menstrual period, says Dr.
If you can't remember your last menstrual period date or if you have consistently irregular cycles, the doctor can use an early ultrasound to give you a fairly reliable due date.
Due dates are often referred to as estimated due dates because a woman's cycle and the baby's growth can vary, says Deena Blumenfeld, Pennsylvania-based Lamaze certified childbirth educator.
"Only 5 percent of women give birth on their due dates, so we often tell moms that it is more like a due months," she says.
I concieved on sept 2nd, but after my doctors visit, with the ultrasound and other tests, results say i actually conceived two weeks prior when i know that isnt the case.. I am very confused about this because I got married on Augest 31 of this year my hsband drove in on the 27 we only had s_x from the 27 to the 1 of september I am due June 9 I am 7 weeks pregnant but they said they think my conception date was around sep 16 which is possible because I have NEVER cheated on my husband but for it to be sep 16 that means I would have had to which is bull c___p..
Kayla, when you get your u/s they always put two weeks on top of it.