Best way to track ovulation?

Brittney • Married 8-14-2014~ Due Oct 5 2017 🎃
Hey ladies I am looking for the best way to track ovulation! My husband and I are going to start trying in a month or so and is like to start figuring out my ovulation. I used to have a regular period. However last month I was last and this month I am late again so I'm not sure what's going on. What have you used and why do you like it?