Particles in urine?

Hi all, I have an odd question. Are dark particles in urine a common thing with chemo? I'm on my third round of AC and just in the last week, I'm noticing what looks like tiny pieces of dark red tissue looking pieces in my urine. My urine is a little cloudy, but I have no pain or other changes. And I'm drinking tons of water, so I know I'm not dehydrated. Sorry for the gross question, but it has me a little concerned. I'm going to put a call into my onc tomorrow, but was hoping someone else has had this or knew what could be causing it.  Thanks.