Can antibiotics affect my period?

Patient: I had sex two weeks ago (my first time and last day of my period). We also used condom. After that I was put on antibiotics for a UTI (5 days). Now i started bleeding (bright red) with cervical fluid its too early for me to have my period. I was just wondering if it’s possible that I’m pregnant or it is has something to do with the antibiotics? Heelpp!!

Symptoms: bright red blood with cervical fluid (not that much)

Doctor: