Can someone help me out..

TMI: So I'm CD 18, I'm supposed to be ovulating, well I'm in my fertile week. I just wiped after going to the bathroom and had this. Now this happened yesterday too, but only 1 time and went away. I'm not sure what to think, I'm not in any pain, no cramps. Thoughts??

This is my OPK this morning...(I know it's not positive)