** Thanks for contacting with our health concern 1. probably with UTI what you are feeling is bladder pressure and although urine test does not indicate a kidney stone, check with ultrasonography of abdomen [KUB region] to exclude renal/ureteric colic. PS. bladder pressure feels like more of chronic ache rather than muscle contraction. 2. As you mentioned pain near hip area thus the noticeable effect of UTI [bladder pressure] is Interstitial cystitis [IC], [and one of the symptoms is the pelvic pain] so it will be a good idea to follow up with your attending doctor regarding detailed medical history, pelvic examination, and necessary investigation. [cystoscopy, biopsy, urine cytology], if needed 3. Initially, your doctor might prescribe you a tricyclic antidepressant to help relax your bladder and over the counter medicines like ibuprofen, acetaminophen to relieve pain, also make sure to avoid: . carbonated beverages, citrus fruits, Vitamin C, caffeine, alcohol, tomatoes, and wear loose clothes and doing stretching exercises can help reduce your IC symptoms