Confused

Nomi

So I’m currently 6 days late. This morning I had brown discharge (kinda a lot at first) that I thought was me about to start my period. After I cleaned myself up I haven’t had anymore since. That was around 8 this morning. I tested a few days ago and I was negative. Should I test again? Was this implantation bleeding? Is my period coming? I’m never late. My periods are ALWAYS on time. I track ovulation several different ways.