I am on the pill and have been for years

Patient: I am on the pill and have been for years and had to go on antibiotics. I finished the antibiotics and for 5 days took the pill before I got my period which was due. I when had sex the day after my period finished (my doctor said after my period I could have sex again) but a week later of unprotected sex I have a brown discharge which I don’t usually get does this mean I’m pregnant

Doctor: