If you got a negative with FMU can you get a positive later that day?

Just as the question says..

Is it possible to get a faint line or BFP later in the day with a 3-4hr hold if you got a negative with FMU??

I swear I can see a VVVVFL but it’s not visible in pictures.. if I hold my pee for 3-4hrs could

I get a positive?

Anyone with experiences?!

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