After I peed today and returned to my room, I felt like I was going to wet my pants. It seemed like pressure was being put on my bladder and I needed to pee immediately. When I tried to, I couldn't and the pressure got stronger. I wiped myself anyways just in case and the toilet paper was a little pink. I was scared so I started doing a little research. I can't seem to figure out what it is but I think I'm spotting. I went to pee again a little later and it was very painful at first and then blood came out. I have been feeling this pressure for about 3 and a half hours now. It's extremely uncomfortable and I'm afraid to go to the bathroom. What can it be?