You squint. You hold it up to the light. You take it to the window, then back to the bathroom. You snap a photo and enhance the brightness. Is that really a line? Or just your desperate hope ...

Add Yahoo as a preferred source to see more of our stories on Google. Home pregnancy test results are only accurate within the first 10 minutes, so read results promptly to avoid misleading lines.

When you take a home pregnancy test, you'll see lines indicating your results. One line confirms the test is working (control line), and a second line shows if you're pregnant (test line). Any second ...