Hello, As you have taken Postinor 2 emergency contraception for unprotected intercourse and periods did come so although chances of pregnancy are not certain. Since I m unable to examine you directly and take a thorough and meticulous history, it is best to see a gynecologist for necessary evaluation and examination. If the doctor s examination and investigation come out to be normal, it could be urinary tract infection and according to the journal of American family physician: Patients at risk of complicated urinary tract infections are best managed with -Broad-spectrum antibiotics initially, - Urine culture to guide subsequent therapy, and - Renal imaging studies if structural abnormalities are suspected. Patients should be counseled about risk factors such as spermicide use, frequent sexual intercourse, and new sex partners, as well as preventive measures, like -Daily intake of cranberry juice has shown benefits in women. -Several studies have demonstrated the effectiveness of using topical estrogen (estriol vaginal cream nightly for two weeks, then twice weekly for eight months), but adverse effects are common. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Munish Sood