my daughter who is 7 years old, had her appendix removed on November 15th, a few days after surgery, she started experiencing pain when urinating. We told her to the doctor on Monday Nov 20th, they tested her urine, no infection. Took her to the surgeons office the next day, since her urine test was negative for infection they said that they didn t know, that the pain could be from the surgery. She is still experiencing pain when she urinates, should I took her to the ER?