Hello dear Understand your concern. Mirena is long acting hormonal contarceptive. It is effective for 5 years and safe. It should be put by gynecologist or trained healthcare provider. Following are the common side effects: bleeding in between period and spotting, amenorrhea, Vaginal and urinary tract infections pelvic pain, ovarian cysts, Mood swings, dizziness, tiredness, acne. Tubal pregnancy. But it require regular follow up for placement of IUD. As there is chance of misplacement or perforation of uterus. I think in your case it is UTI/urethritis or vaginal infection. Continue your antibiotics for more two days Drink plenty of waters Fruit juice like: papaya, cranberry, orange, pineapple. Wash your vagina with warm salted water Tablet meftal spas Wear loose pure cotton inner wear Keep the vagina clean and dry. Repeat the test after week or do urine culture or test for vaginal discharge for diagnosis of exact pathogen . And than take treatment accordingly to report Hope this may help you Best regards Dr. Sagar