Author information Article notes Copyright and License information Disclaimer. Methods for estimating the due date. An average gestational period duration of pregnancy from the first day of the last menstrual period up to delivery is days. It may be below beats per minute but this will increase to between beats per minute by 7 weeks. Thus a 6-week gestational age would be a 4-week fertilization age. This did not affect the median pregnancy length and thereby the systematic discrepancies data not shown. The best available data support adjusting the EDD of a pregnancy if the first ultrasonography in the pregnancy is performed in the third trimester and suggests a discrepancy in gestational dating of more than 21 days.
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LMP defined most pregnancies as post-term 9.
The fetal heart should be easily visible. On average, this is 9 months and 6 days.