I usually cycle 30-36 days... depends. and varies.. july 18 was last AF - first day... DH and were not careful after that AF... and BMS on Aug 3 - which is day 16.. a few days later I noticed CM... about 3 days later -5 days... CM was there for about 3 days... due for next AF on 8/20ish.. that is like 33 or 34 day cycle.. took test today, BFN but that would be about day 27 - probably too early?? HOw do you know when you ovulate?? When the CM is there, is that ovulating??