12 DPO implantation ?

Mary-ann
Have been temping and have had high temps this whole time but had a dip today af is due tomorrow (28th) but I dont seem to have any signs of it normally I start spotting on cd 39 and start AF full on at CD 40. Is there still à chance I will get my BFP? ( with my oldest son I got my first faint BFP at 15DPO) im just trying so hard to figure out what's up and hoping so much that she doesnt show her ugly face tomorrow