burning sensation with a lil bit of blood in it and it smells bad

I am a 18 year old female who is healthy and I am sexually active I do dat every once a week and I was fine but now I just started to have this urge to have to use the bathroom and its all the time and I dnt even hav to pee a lot its a little and it smeells bad and a little bit of blood comes out and I just was wondering what's going on with me y is this happeng