Why were there two horizontal lines instead of a plus on pregnancy test?

In a pregnancy test, two horizontal lines indicate a negative result rather than a positive one. The presence of one line typically signifies that the test was performed correctly, but no pregnancy hormone (hCG) was detected. The "+" symbol is often used in some tests to denote a positive result, while horizontal lines can serve as a clearer visual indicator of the test's outcome. Always refer to the specific instructions of the test for accurate interpretation.