Negative opk, spotting mid cycle

I have been ttc for about 6months, first time ttc, no kids, my periods are pretty much on time. Except two months ago, I was late and I got a positive pregnancy test, my period came about two days after the positive, I have been noticing recently that I spot mid cycle, I was thinking that’s me ovulating, this month is my first time doing opk, but now I’m spotting but it’s negative opk. is that normal? Or does it mean I’m about to ovulate?