hi hunny...is there little bits of blood when u urinate? also do you feel the urge to go to the loo quite alot..if so then it sounds like cystitis..a urine infection..see ya doc...antibiotice will make it better....having unprotected sex can lead to all kinda bad infections...use a condom hunny ;-)....its not worth risking your health or your life ;0).....
It could be a urinary tract infection. You should see a doctor.