OPK LH question

Sara

So, I have PCOS and have been taking Ovasitol since November. My cycles are shortening (Aug-October 65ish days,November was 58 day, December into January 52) I’m on CD 13 today. I take BBT daily at the same time and have no drop yet. In order to conserve OPK tests I’d like to only start taking them when necessary. This also helps me not become obsessed 😅.

Last two cycles I ovulated between CD 32 and 35. Should I just start testing so I don’t miss it or could I maybe wait until closer to CD 30??