Clearblue digital opk question

Nakisha

So I took this and the one line looks really blue but got a empty smiley face. Backstory I'm 13po from when I got a peak on these but also started spotting right after very light basically just when I wiped. That lasted till yesterday. Went and got a blood pregnancy test because I was getting faint lines on first response and my hcg was less than 1. I don't have normal periods and sometimes I'm lucky if I have a period 2 or 3 times a year. Anybody have anything like this happen?

Update this was the one I took this morning. I took another one a few minutes ago and I got a flashing smiley. Any opinions should I bd tonight? What was the one 14 days ago then?