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i just got this off of web MD
-Fetal ultrasound usually can confirm pregnancy 6 to 7 weeks after the woman's last menstrual period.
-Fetal ultrasound can be done to predict a woman's due date and estimate the age of the fetus.
-If fetal ultrasound is done during the 7th to 14th week of pregnancy, the age of the fetus can usually be determined to within 5 days.
-From the 14th to the 26th week of pregnancy, ultrasound to determine the age is usually accurate to within 7 to 14 days.
-After the 26th week of pregnancy, ultrasound becomes less accurate at determining the age of the fetus.
-Fetal growth rates are checked by comparing the size of the fetus's head, limbs, and body with standard tables.
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