I think i have a bladder infection . I feel a strong urge to urinate but when i try to go, nothing or very little comes out. there is some blood and little clots in my urine , and i have checked to make sure it is not coming from my vagina . I am sexually active, 19 years old, and i have had this discomfort for about 3 hours now. It woke me up, and i am unable to go back to sleep because it is so uncomfortable. Should i go to the ER or wait until monday when my campus doctor is open?