Im not sure what this means?

Okay, so my husband and I are trying to concieve, and I though I ovulated 2 weeks ago from today ( saturday), so we BD'd ALOT during that time. Anyways, today would put me at 14 dpo, and still no period but I am getting a BFN. What was weird was yesturday morning when I woke up and went pee, I wiped brown gooey stuff.. I thought for sure that was it and AF was here, so I put on a pad and went on my way. Well half way through the day, nothing... And now its the next morning, and there is still nothing there but still getting a BFN.. Do you think maybe I O'd late and that was implantation bleeding??? Im just soo confused!! I dont temp so Im not sure about that. According to my CBEFM, that saturday was my peak day... help!