I pee brownish red liquid i think its pee mixed with blood but im not sure from !

I pee brownish red liquid i think its pee mixed with blood but im not sure from what it can happen?

it does not hurt to pee or after / before i pee i did tend to hold it in alot durring school (my teacher was a *****) usualy for about 40 minutes when i realy needed to go. also usualy an hour or so after i pee my urine is back to normal (almost perfectly clear.. what could this be ? o yea also i dont pee blood often and im 14 and male

3 weeks ago
also this only happened to me 2 times and they were about 3 weeks apart from each other

It can be a kidney or bladder infection, in which case you might have lower back pain. Make yourself pee before class and see a doctor peeing even a little blood can be serious if left untreated. Tell your parents that your teacher is being a butt about it and maybe they can get you some help. If you do pee yourself in her class once she will stop.