Implantation bleeding!

Ladies what is the heaviest your implantation bleeding has ever been and if so how long did it last?? Not sure if this is what I'm experiencing or not. The day before yesterday I started spotting very light brown. Me and hubby Bd and I wiped afterwards and the spotting got a bit heavier pinkish red and I figured it was AF showing up so but yesterday and today I've noticed the spotting is stopping and between both days and it's very light. Not enough to see on the pad. Maybe two drops but that's it. And now my boobs are extremely sore!!! Could it be af or implantation bleeding. Don't want to get my hopes up again. Thanks!