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The first trimester is generally considered to comprise the time up to 12 or 14 weeks from the LMP.The second trimester extends from the end of the first until about 26 to 28 weeks from the LMP, and the third trimester from the end of the second until delivery.Ultrasound Dating Ultrasound can be used to date pregnancies, especially when the LMP is not known (for example, pregnancy after a delivery but before a menses occurred or irregular menses without predictable ovulation).Ultrasound dating is based on a series of measurements of the gestational sac in very early pregnancies and of the embryo or fetus itself as pregnancy progresses.It is also important to note that the phrase “late-term,” popularly used by the media to describe later abortions, has no medical meaning and is not used in any medical documentation.

This method continues in the subsequent trimesters.The average time between menstrual periods is about 28 days, and ovulation occurs about 14 days before the next period begins.So when we say a woman’s estimated gestational age is six weeks’ LMP, we mean she conceived about four weeks ago, around the time of ovulation.Naegele’s rule involves a simple calculation: Add seven days to the first day of your LMP and then subtract three months.For example, if your LMP was November 1, 2017: In this example, the due date would be August 8, 2018.

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