Is it too late?

I’m not <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>, I thought I had the basic idea of when on the 16th Now I have reason to believe I may be ovulating today. My CM is different from what it was on the 16th. We didn’t BD yesterday and hopefully we’ll have time today. If not do we still have a chance? Been trying for nearly a year.