Can you ovulate days after a positive OPK?

Hi , so I got my static smiley face on the clear blue advanced kit around the 11th of august , I am now currently 3 days late. BFN. I am normally regular each cycle and track my symptoms to prevent pregnancy normally for the last year so I know when AF is on its way by my emotions and headaches. I have had very sore veiny breasts for the last 4 days , lots of cramping I would say for the last 3 days. It feels like AF is coming I go to the toilet and it’s just white CM. I’m having lower back pain , in my hips that come & go and leg cramps.

When I eat and drink and sit down I feel like a pressure feeling down where my pubic bone is.

Sorry for TMI but normally when me and dh dtd it would bring on AF when I’m due and nothing.

Sorry for making this so long , but I just wondered could it be possible to ovulate later than the opk showed positive? I’m not saying I’m pregnant as I know many will tell me I’m not but I’m just concerned about the AF like cramps and no period.

Any advice would be massively appreciated - thank you so much 🤍