cd35-6bfns-negativ blood work-implatation bleeding

Hey guys!
Im 29 ttc for 9 months. LMP was june 24  and now on cd 36 with no AF! Took 6 Hpts all bfn/ blood test came today also negative! June 17-21 i think i had implantation bleeding.. Very dark brown almost black spotting! Anyone experienced the same??? Help! Where did af go?