Pregnant ???

Hello, I started having some spotting Wednesday night and it ended last night (Friday). It was brown (old blood) with a little bit of red but it was more like a discharge texture. Glow predicted AF was due July 4th, but it didn't show. I took a clear blue weeks estimate digital test a few days ago and it said not pregnant. Could what I experienced be implantation bleeding? Or could it have just been a wacky period?