Crazy AF or Something Else?

Okay so AF was suppose to arrive June 18 but she came June 15. My AF last 4 days. She started out normal the first day ,just a light to medium flow. Then the second and third day I experienced cramps and I never cramp but in my 2ww I cramped. I had tissue deposits which is normal. But my last day I started seeing tanish brown mucus . And it was a lot. Then AF seemed to end . But the next day which is day 5 I still was seeing the weird tan brown mucus. And day 6 which was the 20th  I was in the clear UNTIL I wiped and saw a twinge of dark blood and then later I spotted some more. Now I'm sure she's or its gone... Should I be concerned. What was that all about?