Implantation bleeding?

Ok so my last period started July 6th (I’m on Progesterone only birth control but it didn’t come until Friday) and ended on about the 11th of July (it was very light). Me and my bf had sex that day on the 11th but we also used a condom. It is now the 17th and I’m experiencing a tiny bit of bleeding every now and then. The app says my ovulation window started today which again is the 17th, and so I’m just wondering is this ovulation bleeding? Because I’ve never had that before and this is my 4th month on the pill. Or could it be that I’m pregnant and implantation bleeding is occurring?

Thanks!