Talk to Gynecologist on Pregnancy

I am facing symptoms of peeing at night 5-6 times at night with itching and pain from one week as well as back pain headache mood swings. I did unprotected intercourse on august 17 on my first day of period and bleed heavy 17,18,19 and some drops on 20. My this cycle was 25 days. one week ago when I started feeling pain and burning while peeing I took cran-max but pain was healed for short time. 2 days ago I visited gynecologist she prescribed antibiotics. After taking antibiotics I am feeling severe back pain shortness of breath as well as fever chills and some change of urine color as well which was light. can some one help will this be due to pregnancy or something else. Should I continued antibiotics or not