Implantation Bleeding?

Okay so long story short i was having pregnancy symptoms i had 'af' on the third. usually my af is light on the first day cramps kivk in on 2md and 3rd day and is heavier then on 4th day it lightens up leaves...this time it lasted 3 days. the first day was rather heavy with cramps and tht was it. then the 2 days after it was very light spotting...ive taken a couple pregnancy test they came back faint possitives. ...could tht have been implantation?