I'm a breastfeeding momma to a 5 month old baby.

I was getting very tender and sore breasts randomly so I took a pregnancy test.

Midday urine on a 2 hour hold, very hydrated and It came out totally positive!! (Picture below)

I had another test, and waited until the next morning to use fmu just to see how dark the line would be. And the test was completely negative! (Also pictured below) these tests were taken LESS THAN 20 hours apart and I'm so confused...

Does breastfeeding effect a test? Has anyone had this happen? I dont have a period so I have no idea where I'm at in a cycle either.