I need help

So the last 3 or 4 days ive had this weird, im not even sure what to call it, spotting, discharge? Im not sure. Im currently on cycle day 26, but we are taking a break from tracking ovulation and stuff at the moment so i have no i dea how many dpo i am. My period isnt supposed to start until the 18th, and my cycles are usually pretty regular. Everything has been this same sort of brown and when i usually get my period its bright red and way more, this just seems like brown discharge to me but its been going on for a few days now so im not sure. Does anyone know what thia could be or has anyone else experienced this?