There are generally four kinds of pregnancy test results, namely, positive, weakly positive, negative and invalid, and how to read them are as follows: 1. 3.Negative: A negative pregnancy test result means no pregnancy, only a red reaction line in the control area. 4.Invalid: A pregnancy test may have an invalid result, usually showing no red reaction line on the test paper, or only one reaction line in the test area, which indicates a failed test or invalid test paper. This indicates that the test has failed or the test paper is invalid.