I'm a 21 year old healthy male. About 3 months ago, I had pain in my right kidney. Went to 2 different doctors, had ultrasounds, and it was determined that I had several non-obstructing calculi in my right kidney. To make long story short, I passed a 5mm kidney stone on my own right around Xmas. (never had the classic horrible pain though, just constant light pain/discomfort in kidney/urge to urinate often). Everything was fine until about last week when I began to feel a slight pain in the same kidney as before. My urine (like last time) had some visible blood in it, but would go away once I began drinking a lot of water like in December.
I also notice every once in a while when I urinate, I see a very small, red tissue/speck in the toilet. So, since I had many small calculi, I figure I just have another stone coming but the tissue threw me off/is worrying me.
Is this normal while having kidney stones? What is this?