Can some please help me.. I have a question.

June 23rd was my last period everything was good but on July 21st I had some spotting nothing would be on my pad only when I wipe and it be a light pink kind of see through like a mucus it lasted 24 hours pinching a little bit of cramps but nothing that hurt really just kind of uncomfortable well since then I haven't gotten positives on my ovulation test in I am around my ovulation day and I'm not even getting a slight positive or anyting like nothing is showing and I'm not even getting a positive on a pregnancy test can somebody help me and tell me what's going on if they have a clue. Also does anybody know how long it takes to get a positive after implantation bleeding if that's what I was having instead of my period!