So a couple of days ago I had unprotected sex and the next day i was experiencing a frequent urge to go to the bathroom. When i would go it would burn and be very painful. I would urinate a little but mostly a thick, yellowish, bloody muscus would come out and the pain would last like 30 sec longer. I have had urinary tract infection before and that is what the pain feels like but i have never had a mucus discharge. I also took Plan B within 12 hours of having unprotected sex. What could this be?