chances of getting pregnant before ovulation

To
I had sex on days 9,10 and 11 on a 29 day cycle when I ovulate day 14-15. I had spotting (brown) on day 14 and a bit on day 15 but no real obvious change in cm.. None of that stringy stuff they talk about. Due to my partners shift work we were only able to do it on day 9,10 and 11 and again day 16. What are the odds?