A 21-year-old woman presents with 3 days of abdominal pain, dysuria, suprapubic pain, and dark urine. She has increased vaginal discharge but denies fever, chills, nausea, vomiting, diarrhea, dyspareunia, or vaginal itching. Recently started a relationship, intermittently uses barrier contraception, and has had multiple sexual partners. No history of STIs or UTIs, normal Pap smear, no surgeries. Allergic to shellfish, consumes alcohol on weekends, and smokes cigarettes daily. Takes oral contraceptives regularly for 6 months. The patient is in discomfort, with vital signs within normal limits. Physical exam reveals moderate suprapubic tenderness. Pelvic exam shows mild cervical discharge, no cervical motion tenderness, and a non-enlarged uterus with no palpable masses. The pregnancy test was negative. Urine analysis showed 5-10 white and 25 red blood cells, along with a few bacteria. It was positive for leukocyte esterase and negative for nitrites. Vaginal examination found no trichomonads, clue cells, or yeast. Which of the following diagnoses is most likely,