Am I preggo?? Will i get my BFP?

Dh and i are in month 3 of TTC.I believe I am having some cramping that is too late for ovulation cramping but too early for AF cramping! I am on CD 20 according to my OPK i should have ovulated between wednesday and friday i did experience some very light cramping, it has not gone away. I am also using pre~seed lubricant & taking pre natal vitamins which i have been on for 2 months now & they have just begun to make me feel nauseous! I know this may be TMI but on sunday night when i went to apply my pre~seed ( it goes up in you ) there was a small amount of blood! What is this? Implantation bleeding/cramping i know not many women evperience that? I thought it might be too early for implantation PLEASE HELP.. Much thanks in advance