PAIN! Help

Every night for about 2 weeks now, I've been getting a bad pain going from my pelvic bone, around the right side of my vagina and into my butt. It's like very intense cramping. It's always very uncomfortable but bearable. Last night it was so bad that I was crying and went to the hospital. This hospital sucks (not planning to deliver there) but it was closest. They said I had blood in my urine but nothing was causing the pain and nothing caused the blood and sent me home. Has anyone else experienced this? I'm going on 30 weeks.