For many people, a missed period is the first signal that they're pregnant. However, this often isn't the first sign of pregnancy your body gives you. From hormonal changes to swollen breasts or ...

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 ...

Valve disease affects how blood moves through the heart, and pregnancy is often a time when symptoms first appear or become more noticeable. Learning about a heart valve condition during pregnancy can ...