Best time of the day to test using OPK

Katie β€’ 30 πŸ‡¬πŸ‡§ Ttc baby #1 πŸ’— 18 months ttc 🀞🏻 2nd round of Clomid

Been ttc for 18 months now. My doctor initially said not to use OPKs because they could make me stressed.

Due to start Clomid later on this month and want to start using OPKs... so question is what’s the best time of the day to test?