Cat problemm!! help!!?

Okk so my cat keeps on peeing in my bedroom, always in this corner and now on the sides of my room. Im gettin really upset because it is always in my room. This started happening maybe around 7 months ago? Maybe longer.. But about 1 month ago i was trying to clean it up in a corner, and i found red in the urine. She hasn't really been acting weird but now when i touch her belly she gets all defensive and tries to attack my hand(when she did this before, it was playfully). So uhmm i have 4 questions. How can i get the stains out of my carpet? How can i get rid of the smell so my cat won't smell it? Whats wrong with my kitty(if there is anything wrong)? And if there is, what should i do?