When did you start using opks?

Jessica
Hi ladies! My first time posting here and ttc #1 at 25. I got married at the end of May and this is our second cycle ttc, first 'real' cycle after stopping bc (currently in 2ww - test date 10th August eek!). 
I was just wondering how soon you girls started using opks when actively ttc? As I said this is only my second month ttc so I know it's only early days yet and don't necessarily want another thing to obsess over 😂, but I just want to make sure we are giving this our best shot! X