What could be going on ?! 😩

Sam

I'm so confused now. I started my period June 27 it lasted til July 3. I had some brown spotting days after. But then I BD July 7th & I've been bleeding like a light flow no pad or tampon needed just a panty liner. I've been having some cramping with it as well. But nothing strong just something here & there. Glow says starting today I am in my fertile window but why am I bleeding/spotting. Do anybody know what's going on ?!