I Have Lower Right Sided Pain For 5 Days, Which

I have lower right sided pain for 5 days, which has now spread to my back at. First it was dull constant pain now pain varies but is sharp. I have had a ct scan which showed fluid in abdomen and an ultrasound but I've had two days in a row of blood work and urine test and show no signs of infection. Pain has only gotten worse what am I suppose to do or think