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Did you get your very first ultrasound in your second trimester? The most accurate due date predictions come from ultrasounds performed during the first trimester, not the second, according to a study in the American Journal of Obstetrics and Gynecology.
Every time you visit your health care provider, she’ll check your fundal measurement — the distance from the top of your pubic bone to the top of your uterus.
From that day, 40-weeks of pregnancy is officially counted, and your doc or midwife busts out the red pen and marks your due date on the calendar. However, many pregnancies are confirmed by a Doppler heartbeat monitor, not an ultrasound.
If this was you, that could be why your doctor’s original timing was off.
If the difference between the two is less than a week apart, she’ll generally go with the date calculated from your last period.The purpose of the dating scan is to: Some abnormalities may also be detected at this scan, such as neural tube defects (spina bifida is a type of neural tube defect).This depends on whether you have agreed to have the screening and when the scan takes place.Transvaginal ultrasound can see embryonic development about a week before transabdominal ultrasound, the American Pregnancy Association (APA) states.
A transducer, a wand-shaped probe, is inserted into the vagina and pressed against the vaginal walls directly next to the uterus.
Pregnancy is dated from the first day of the last menstrual period, so at four weeks, a woman is just due for a menstrual period.