I had a peak fertility on my digital opk cd 11-12. on cd 17 i had egg white mucus. when did i ovulate? was opk wrong?

The opk may be wrong: The digital lh monitors are good but there can be false positives. On the other hand clear cervical mucus is a good but not perfect sign of high estradiol usually from ovulation but can be from an ovarian cyst. Consider working with a physician to check via ultrasound or blood to better know your cycle if this happens repetitively. Also when the next cycle comes or you have a +preg test will help