What does a faint negative line mean

Asked for Female, 31 Years 44744 Views v

Asked for Female, 25 Years 8197 Views v

Asked for Female, 24 Years 13802 Views v

Asked for Female, 22 Years 1148 Views v

Asked for Female, 34 Years 154 Views v

Asked for Female, 21 Years 260 Views v

Asked for Female, 22 Years 467 Views v

Asked for Female, 32 Years 537 Views v

Asked for Male, 25 Years 975 Views v

Asked for Female, 34 Years 245 Views v

Asked for Male, 30 Years 65 Views v

Asked for Female, 28 Years 36 Views v

Asked for Female, 33 Years 406 Views v

Asked for Female, 30 Years 150 Views v

Asked for Female, 28 Years 110 Views v

Asked for Female, 20 Years 94 Views v

Asked for Female, 20 Years 80 Views v

Asked for Female, 27 Years 83 Views v

Asked for Female, 34 Years 107 Views v

Asked for Female, 29 Years 164 Views v

Asked for Female, 27 Years 311 Views v

Asked for Female, 26 Years 141 Views v

Asked for Female, 26 Years 255 Views v

Asked for Female, 31 Years 137 Views v

Asked for Female, 25 Years 129 Views v

Asked for Male, 31 Years 91 Views v

Asked for Female, 31 Years 103 Views v

Asked for Female, 29 Years 168 Views v

Asked for Female, 31 Years 615 Views v

Asked for Female, 27 Years 389 Views v