This Is The Second Time That This Is Happened. Something

This is the second time that this is happened. Something brown that looked like a chunk or flesh came out when I urinated. I am 18 years old. I have never had sex. I did not have my period last month. And I believe that the first time I had a chunk like thing come out of my urine, it was much bigger, maybe the size of a penny or a bit bigger. The first time happened around the middle of October and the second time happened today. I'm just wondering if it might have to do with my period being irregular.