If the control line does not appear, your test should be discarded, as it's likely not going to give you an accurate result.

When you take a home pregnancy test, you look at the results window to see whether there are two lines or just one. The first line is the control line. If that's all you see, your result is negative.

A very faint line on a pregnancy test can be confusing, especially if you’re hoping you’ve conceived this month. Could ...

Pregnancy tests with blue or pink dye typically show one line if the result is negative and two if hCG is detected, meaning the result is positive. If you get any type of second line, even a faint ...

Whether you are trying to conceive or are concerned that your birth control went wrong, a pregnancy ... tests will display your results in one of the following ways: a change in color a line ...

Digital pregnancy tests that display the words "pregnant" or "not pregnant" on a screen often cost about four times as much as ones that simply provide a single or double line on a paper strip to ...

similar to birth control pills, according to the Food and Drug Administration. It is not designed to work if someone is already pregnant. Pregnancy tests work by identifying pregnancy hormones in ...