Fox Health: Length of a healthy pregnancy can vary by as much as 5 weeks, study shows

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Length of a healthy pregnancy can vary by as much as 5 weeks, study shows

How long a healthy pregnancy lasts can vary by as much as five weeks, even when doctors precisely determined the date of conception, a new study suggests<img src="http://feeds.feedburner.com/~r/foxnews/health/~4/R2QxxAl1aSM" height="1" width="1"/>

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