Extremely long period?


So, someone PLEASE give me some advise or information about what may be going on if able to.

My normal period lasts no longer than five days. With that being said, I started on the 5th of this month, but I'm still bleeding and it's now the 15th. That's 11 days worth of bleeding. I have never bled that much during a period before throughout the entire amount of time I've been having periods. I've had cramps on and off, sometimes very strong, other times nothing at all. Does anyone have possibly have even the slightest idea as to why this may be happening? I would kind of like some input/advise before I go making an appointment somewhere, so I could really use some help. Please and thank you! 😊