I had a bfp and a faint bfp then 2 bfn's and still no af what is going on?

hiya well i had 2 bfp's one very faint and the following morning bfn. the week before testing i experienced what i think is implantation bleeding which was 5 days before af was due. if now on cd36 of a usual 28 day cycle wondering what the hell is going on. am i still pg i also have lots of cm sorry for tmi xx