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The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age.

Like Oath, our partners may also show you ads that they think match your interests.Learn more about how Oath collects and uses data and how our partners collect and use data.Select ' OK' to allow Oath and our partners to use your data, or ' Manage options' to review our partners and your choices.In addition, although a woman is most likely to become pregnant if she has sex on the day of ovulation conception may also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to five days before ovulation [26,27]. Determining the Estimated Due Date The estimated due date (EDD or EDC) is the date that spontaneous onset of labor is expected to occur. Conceptional age, menstrual age, and ultrasound age: a second-trimester comparison of pregnancies of known conception date with pregnancies dated from the last menstrual period.

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