Abnormal AF

My AF usually last for 3 days, but this cycle has lasted for 10 days with no signs of stopping. I also started a week early and it started off very light pink and super light, I had no cramps or sore boobs or any other pms signs that I usually do. The 2nd day got a little heavier and brighter, and just kept getting worse from there. Has anyone ever had this happen? If so, did you find out the cause? Oh, and I'm not on any BC or any other meds. Any answers will be helpful!