Taking a pregnancy test too early can procure a false negative result. How do you know when it's time to take one?

Evaporation lines on pregnancy tests are faint and colorless, appearing when the urine dries. Reading a pregnancy test within the recommended timeframe can prevent misinterpreting evaporation lines as ...

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 ...