Today I am 12 dpo..I've been having continuous cramping since O.  I received a BFN this morning.  My cycles are extremely irregular.  I am on cycle day 43.  I know I O on March 10th bc I take OPK and temp. Today I started getting brown discharge when i wipe.  I'm hopeful it's a sign but my temps have been going down after a large spike 10 dpo.  Could it be implantation bleeding or just me wanting something so bad :(