I'm EBF and tested negative at my 6week checkup on 1/7

The bottom one is from 1/21

Middle 1/22

Top 1/24

With my first I never noticed any faint lines when testing but found out unexpectedly at a doctors appt. This time around I went for just DG test and got what I think is a pretty clear positive but then got two more tests (unintentionally blue dye tests) and now it's more faint so I'm questioning if it's just false positives?? Evap lines?? I thought it would be more clear since it's been a couple days