I don't know what it is but it won't be a positive I'm afraid. It's just an invalid test now. Perhaps it's a second control line. Your prob best off goggling the brand of the test to know for definite
It’s just where the dye sits, it’s almost like when you wet a piece of paper that has ink on it and it runs, on a test that line is where the dye has ran to
It may be hard to see but it’s a very clear pink line, then what would be the results window, then the control line.