Reasons for spotting before period??

Brittnee • Mama to two boxer pups, three angel babies, and my perfect rainbow baby boy born 8-4-21🌈💙

Anyone know of reasons I could be spotting before my period that doesn’t include pregnancy?? Started spotting 10 days before af and im still spotting four days later. It’s light brown discharge no need for a pad or anything but I’m getting negative pregnancy tests and have never spotted this early