4 preg. test with faint PINK lines in the result window...could all 4 be evap lines?

I took 4 preg. test. the same brand , 2 in the afternoon and 2 in the morning. the ones in the afternoon showed a faint pink line after the allowed time and the ones in the morning showed the faint line within 7~8 min. my period was due on the 28th and i had light brown~pink spotty discharge for about 4 days starting on the 16th. The test were done over a 2 day period. So could all 4 be evap lines or faint pos.? all of the lines are a pinkish~purple color ...thanks