How accurate are ultrasounds at dating pregnancy

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I have been measuring ahead from the beginning of this pregnancy.

Determining the Date of Conception Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception.

The tech (who I know is very good) measured his head, tummy and femur bone. According to the ultrasound machine, he already weighs 9lbs.

The tech did warn me that that weight could be somewhat inaccurate.

"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" [24].

In today's world, most moms find out the sex of their baby before birth.

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