period or something else?

Cougar
I've been of bc now for three months. The first two months I had a normal period that was just a day late or early, so nothing really irregular. I'm supposed to start af on the 24th but for the past two days I've been having brown spotting/discharge. It's not frequent maybe just once a day for a half hour and then that's it. I have no cramping associated with it. Does anyone have any idea what this could be?? Or is my body still getting used to being off bc and this is just my period??