Spotting before af- thoughts please!

So last night at 11dpo I checked my cervix- there was creamy cm tinged in pinkish/brown blood.. This morning I checked again thinking AF was coming early and my bbt dropped below cover line this am- there was one or two bits of brown discharge and now there's nothing- my cervix has been high soft and I THINK closed.. My af is due tomorrow- do you think it's possible late implantation or the witch playing tricks? I didn't test today because last night was bfn.. I've never experienced this in either preg or non preg cycles