Me and my girlfriend didn’t have sex, but I rubbed

Patient: Me and my girlfriend didn’t have sex, but I rubbed my penis on her vagina. She is worried that my pre-ejaculation fluids got inside her and carried sperm with it, which will get her pregnant. She has her period 3 days after. Almost a month later, she is late on her period, and she is having brown sporting. She read up that this is a sign of pregnancy. Is she pregnant? What is this brown spotting?

Doctor: