Ultrasound dating pregnancy
the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination.This is presuming that the pregnancy is actually at this stage of development.
Trimesters, however, have a variability of a few weeks, so they should be thought of as general benchmarks.The uterus then typically rises above the navel at about a centimeter a week after that.But a physical exam can be misleading (due to factors such as twins, uterine tumors, or obesity) and is not used as the main way to date a pregnancy if LMP or ultrasound is available.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.
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Most dating scans are done with a trans-abdominal transducer and a fullish bladder.