Implantation Bleeding Question

AF was to arrive in 6 days and I noticed a small small (almost microscopic) amount of blood after BDing. A day later I used the restroom and had a decent amount of pinkish blood while wiping. I wiped until my toilet paper was clean. threw on a panty liner expecting more. It has been 2 more days and no more blood. And AF is due Wednesday. Could this have been implantation bleeding? Or would there have been more and for a longer period of time?