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I have never heard that one. Unless it is so that you can make sure you have enough urine to use. As long as you have to pee then you are fine with just as much urine as you have already. I hope that this helped.
My Dr. suggested using the urine from first thing in the morning, it will have the highest HGC concentration of the day. Drinking too many fluids will dilute your urine and could lead to a negative result. Using the morning's first urine for testing is especially important if you are trying to test before your missed period when your hormone levels will be low and more difficult to detect.