Period or no period

Micah
So a little back ground, I've never missed a period except for when I was pregnant, and my periods always follow the cycle perdicted pretty spot on. I usually have a little brown discharge for the first couple times I wipe and then red blood starts, and when my period is about to end the last couple times I wipe during my period it's back to the brownish discharge. Well my period was 2 days late and then I started getting brown discharge so I kept thinking my period would start any hour now... but I'm on day 5 of only brown discharge and it's not a lot, barely any really. No red blood.. I've never had a "period" like this. I'm also not on any BC. Any idea what this could be from or why I'm only having discharge and no red blood?