Best time of day for OPK testing?

Michelle

I’m reading different opinions on the best time of day to use an opk. For reference I am using the Clearblue Digital opk, and the instructions say you can use it in the morning since it advises not peeing or drinking water for a few hours. However I’ve also read that it takes a couple of hours in the morning for your LH surge, and that you should test later on in the day. Any advice?