Progesterone & ovulation

Hi ladies! I'm on cycle day 41 and third day of progesterone to hopefully give me a period (I have pcos). My question is when should I start opks? Should I wait until I get my period? Or is it possible to ovulate before my period because of the progesterone? My doc prescribed it for 14 days each month to regulate me. Thanks for your input! 💗💗