Implantation bleeding ??

Hey guys. So I was supposed to have my period on July 30th. And it didn’t come. So 11 days later from when my period was supposed to end (August 13) when it still hadn’t come I took a pregnancy test. It came out negative. So I waited another week and took another one (August20) and that came out negative as well. I then took a blood test (August 21st), to which I haven’t yet gotten the results of yet, it’s been a week and a half. This is now around the time I would have gotten my period ( the app isn’t always spot on with that) My boyfriend and I were fooling around a bit and we discovered I was bleeding. It was reddish brown, and I’ve had cramps since around noon. I put in my menstrual cup as I don’t use tampons. I was wondering if anyone else has experienced this. Im not sure if this is implantation bleeding, because to me it seems a bit late to be? But I’m no doctor. I’m not sure how to tell if it’s implantation bleeding or not. I haven’t been experiencing any pregnancy symptoms, no morning sickness, no breast tenderness, I need some help here