Re: you know when women pee blood what is that?
Have you started your period? If it is not your period, then it is probably a urinary tract infection. Infections can cause a burning, or stinging feeling when you pee, and need to be treated.
If it your period, time to get some sanitary pads or tampons, and talk to your mother, sister, or other trusted female to help you understand what is going on. Typically your first period may also be accompanied by lower back pain, cramps, but not everyone has these symptoms.
How old are you?