If you missed your LH surge, when would you start testing?

Silver • 👶🏻9/23👶🏻4/22👶🏻12/19❤️👩🏻‍🤝‍👨🏼🐕🐕

Not sure if I missed it or just didn’t have one this month. Not sure when to start testing? When I would “typically” be 10DPO? Or day of missed period?