Hey ladies so usually I get my period at the end of every month by the 20th till between the 23rd ! I just started ttc and I am really trying to see when I ovulate!I ordered opk strips on Amazon

. How many days do I count to see when I'm ovulating ? I see they have when they believe I ovulate on here . I trust it but how long do I count after my period till I should ovulate helppppp??? And how much do I test in a day with strips for opk?? New to all this all the help would be awesome

Thank you