So confused with these pregnancy tests HELP

Okay so I tested using the cheap amazon tests and could swear I seen a faint line.

One day later I tested again, this time I done one with tap water (top one) and one with my urine (bottom one) to compare incase it was an indent.

I was convinced I could still see a faint line. I then went and bought a clear blue early detection test which was negative.

I am now really confused as to what’s going on - I would appreciate your thoughts. X