Is this normal?

So my periods are about 9 days long 6 days of red blood and 3 days of brown, it should have ended the 23rd but at least once day I have brown mixed in with my discharge, it’s my cycle day 21 and my fertile window ends in 3 days. Should I be concerned? It’s a very small amount of brown in the discharge and it’s been an everyday thing since the 24th