Can I use left over/old/collected FMU


Yesterday I used 2 FRER and got a vfl on both of them

But then today i wanted to test again with FMU. I realized I was out of tests so I peed in a cup and let it sit while I went out to target to buy more FRER. When I came back I dipped the test in my old/collected FMU and got a very clear BFN. does using an old urine sample affect the results??? What’s going on? Are the first 2 I took false positives? Or is the most recent one a false negative? I’m so confused please help me

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