Bleeding

Ta
I started my period on May 20th. It started with light brown spotting then progressively started to become like a regular period for me. It ended the 25th. I noticed yesterday some dark brown blood & today, it was red like a period. I have had sex after my period. Accoring to Glow, I should be ovulating now or around this time, but I've never experienced ovulation bleeding before. With my first baby, I never had implantation bleeding & I feel no pregnancy symptoms. What is this??