2 days late does FMU really make a difference?

I am two days late on a very routine 28 day cycle, I have a list of weird symptoms I could list that aren’t normal but that’s not why I’m posting.

I tested today and thought I could see something, it wasn’t first morning urine and had only held my urine in for two hours.

If I test tomorrow morning with FMU could I get a better result? Will this really change anything?