Ladies with a 29-32 day cycle, when do you ovulate?

I’m new to OPK and last cycle I tested positive for ovulation on D18, and my cycles are very consistent with 29-32 Is it safe to say that I normally ovulate later like that?
I was also curious about the negative tests, I never don’t have a line showing but it’s always faint. If it’s faint does that mean I’m getting close to ovulation? Or would it be faint line for a negative no matter at what point in my cycle