ovulation

I have a 29 day cycle and my last period was October 13 and I counted from my first day of my cycle to 15 days after for my ovulation and supposedly I'm ovulating October 27 or 28 one of those days but glow says I ovulate Sunday the 29. I had sex October 26,27,28. Do you think I will have a high chance of becoming pregnant just because I'm not sure when I did actually ovulate ?