What are the odds of ovulating on day 17 of a 28 day cycle

Amy
Ive been TTC for a year. And we always had sex during my fertile days (according to the average 11-14th day) but for some reason im thinking that maybe ive been wrong about my ovulation! I tried OPKs one month and gave up when i didnt get a positive by day 14. The other night (day 17) we had sex and i was really wet. I felt like i was kind of dry or had creamy CM on days 11-14. I used to give up TTC after day 15 hoping it was time for the 2WW. So im hoping ive just been wrong all these months and thats why i havent conceived. Thoughts?