Pregnancy may accelerate biological aging in women who have never given birth by up to 5.3 years, according to a new study.

Your pregnancy countdown can get jumbled pretty quickly. Are you 13 weeks pregnant or 14? First trimester or second? Three months pregnant or four? Then there’s figuring out your due date — which, for ...

Corrections & Clarifications: An earlier version of this story misstated how to calculate pregnancy duration. It has since been updated. If you think there's a chance you might be pregnant, you want ...

Taking a pregnancy test too early can produce a false negative result. And the prospect of a major life change like pregnancy is a time when you want to make sure you're getting the most accurate ...