@Catherine Ah okay, thank you. I'm usually 28 days.
Start OPK testing from CD 9 twice a day with your first urine after your longest sleep and don't pee after 12pm so you can test again between 4pm and 5pm to hopefully catch your peak, BD one you have found the peak (and they days before once you've successfully tracked your cycle and ovulation)
How long is your cycle then count 14 days back, that's when you should be hitting peak and ovulating