help. chemical pregnancy?

Original tested this past Monday when period was 2 days late and got negative pregnancy test. Retested Friday with a very very faint blue line. Then took digital and it said negative. Retested Saturday am with pink test, and faint, but slightly darker/clearer line. Are these positive tests?
Tonight, i started cramping and bleeding. Cramping is increasing and think this is a little more than spotting. Not quite a full blown period but scared it will be. 
Do you think this test is positive? Do you think it's a chemical pregnancy?