Implantation or period?

I need some help.. So my last period was from July 1st to the 4th .. I am not sure when I ovulated but I was having sex everyday.. On the 27th of this month I started bleeding pretty heavy, some clots, red blood, and no cramps or period symptoms when I usually experience cramping ... The bleeding only lasted 2 days than completely stopped which is rare for me as my period usually lasts 4-5 days .. I'm not sure if this is a period or implantation bleeding if anyone has any useful advice from experience !