12 days late but possibly coming up to ovulation ?

So im 12 days late for af. I had a small bleed the other day that lasted half hour i thought maybe af was starting but then stopped. today I've has spotting but again has stopped. I now have slight backache and ovulation kind of cramping i took a opk and it has a visible line. Ive been using opks for 3 weeks now because

of messed up cycle and only ever had the control line the test line was completely blank untill today. Can i be ovulating even tho i completly skipped a period ? Or am i getting my hopes up and ovulated later than i thought and im actually pregnant and having spotting ? I have posted a photo of my ovulation strip. I've not had a test line for weeks.