Implantation bleeding?

Lola

So I started my period the day the app said I would, the second day I was abt medium flow and it was mostly bright red no cramps nothing but now I’ve basically ended on the 5th day as I’ve had a lighter flow then normal and it’s been a dark brown colour but also sometimes bright red. I haven’t had unprotected sex in about 2 months and I’ve had my period heavy before, I have been quite stressed this month but can anyone help me out