Do OPKs have to be taken at th exact same time every day?

I'm using clearblue digital. I usually take them at 8 am, but would it be fine if I take them at 7-7:30 am some days?

*I always thought they needed to be taken in the evening as well, but these say in the instructions that it can be taken with FMU, and that's what works out best for me.

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