Late period negative test

Sreyrath

I’ve been EBF and had my first period 6 months PP on August 1st. My next cycle was September 2nd. Then nothing. Glow says I’m 4 days late. Flo says I’m one day late. I have had cramping and increased discharge, but no period. I took 2 dollar store test that were negative & one blue dye test that was I couldn’t read because the dye was smeared. Is it possible that breastfeeding caused me to miss my period? Or can you get a false negative? Help. Lol