How do you save FMU?

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Do you just pee in a cup and sit it on the counter? Do you need to cover it?? Amazon is delivering new tests for me tomorrow and I want to test ASAP when I get them! Im 2 days late on my period and I swear when I was testing early I saw a faint line - but everyone else thought I was crazy and now no period so.

How do I save FMU