Hi, so I'm shedding large clumps of white tissue in urine occasionally and my Dr. told me to collect a sample with this tissue to check it. The problem is I can't tell when it will come out and the cup she gave me is too small to catch everything so I always end up peeing it in the toilet. Should I get a big cup, bleach it, pee in it and pour the part I want in the Dr.s cup? Or is that not a good idea?