Implantation bleeding and testing

Hi ladies, I’m just curious yesterday I was two days away form AF and I got some brownish CM when I wiped, very light though. Today same thing and still a negative test. How long after your implantation bleeding did you get your bfp. I’m still not sure if mine is implantation bleeding because usually the day before I’m supposed to start I spot. But what is weird is that I had some pretty good cramping, but only lasted about 20 minutes and went away and now I’m cramp free.