Does FMU cause a false positive on an OPK?

DH2015 • 💋💏❤️ married 3 years with a baby girl born Sept 2018 👶🏻🎀
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This was taken with first morning urine, but I thought I already had my surge a few days back. The thing is- this one looks more positive then the one a few days back so I stopped testing. And now here we are. I tested for fun assuming I would see it lightening up. But this is the first time I’m using FMU

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