A bladder infection is not from too much coffee. It's from fucking like bunnies without a condom. Antibiotics will help. Antibiotics make birth control pills less effective. I'm sure she has a UTI, too. Male urethrea are longer, thus less prone to infection. If a guy has a UTI, his sex partner surely has one, too. I predict parenthood before the end of the year.
Sometimes we make choices by not choosing.