Brown spotting 4 days before Period, Is this a sign??

I experienced brown spotting 3 days ago, and it stopped the next day. I’m expecting my period tomorrow, I’m exactly 28 days with my cycle, it’s crazy how clockwork my cycles are. I’m anxious and nervous because my husband an I have been TTC for over 1.5 years now, that I really want it to be a sign of implantation. Something tells me this cycle is different because I have never experienced brown spotting like this. It would eventually turn to light pink and then my period. But this time it has just stopped. But I also am not experiencing any symptoms either: no sore boobs, no fatigue, no mood swings. Has anyone else experienced spotting in their cycle and later got their BFP? :)