Ugh when???

So looking at these now it looks like i must’ve ovulated on CD 18 cause that’s the only day I’ve gotten a dark line but its still not as dark or darker than the control line so is it really a positive? My last three cycles have been irregular (28, 33, 31 days) so I’ve been having a hard time trying to figure out exactly when I’m ovulating. Which is why I decided to test with opk’s. I’ve been testing every day since my last period and been getting all these faints. I took a clear blue digital on CD 18 after I saw how “dark” the line was to see if in fact I am ovulating but I got a blank circle. Which means, no, not ovulating. But my line even with that test was pretty dark. So confused. Cause then the next day and days following as you can see the line get very faint again.

😫😫😫🤷‍♀️