What does a faint negative line mean

Asked for Female, 31 Years 44558 Views v

Asked for Female, 25 Years 8186 Views v

Asked for Female, 24 Years 13736 Views v

Asked for Female, 22 Years 1101 Views v

Asked for Female, 34 Years 144 Views v

Asked for Female, 22 Years 462 Views v

Asked for Female, 21 Years 256 Views v

Asked for Male, 25 Years 953 Views v

Asked for Female, 32 Years 532 Views v

Asked for Female, 34 Years 242 Views v

Asked for Female, 28 Years 28 Views v

Asked for Female, 33 Years 188 Views v

Asked for Female, 30 Years 100 Views v

Asked for Female, 28 Years 83 Views v

Asked for Female, 20 Years 80 Views v

Asked for Female, 20 Years 71 Views v

Asked for Female, 27 Years 70 Views v

Asked for Female, 34 Years 101 Views v

Asked for Female, 29 Years 149 Views v

Asked for Female, 27 Years 288 Views v

Asked for Female, 26 Years 132 Views v

Asked for Female, 26 Years 242 Views v

Asked for Female, 31 Years 129 Views v

Asked for Female, 25 Years 123 Views v

Asked for Male, 31 Years 86 Views v

Asked for Female, 31 Years 93 Views v

Asked for Female, 29 Years 157 Views v

Asked for Female, 31 Years 534 Views v

Asked for Female, 27 Years 346 Views v

Asked for Female, 32 Years 648 Views v