TMI help

K
My "period" started aug 18, and ended aug 20. In pretty sure this is just old blood but I got this on Aug 25th not sure why it was so late.  
But as of 4 days ago, I've had this... the pictures go from day 1 , 2 and today (I didn't get a picture of the 3rd day).. does anyone know what this is ? 
It was only once a day..