FMU for OPK

I have to be at work at 7 AM. I can't test at work. I've seen where people say not to use FMU but otherwise I will only be able to test between 3 PM and when I go to bed. Wondering if it's that big of a deal or if I could use FMU and still get accurate results. I'm using Clinical Guard purchased from Amazon. The instruction say nothing about this.

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