What are the chances of pregnancy if you use condoms, take birth control at the same time everyday, and only have sex once a month?

Very low: That's about as good as you can get if you're sexually active.

Very unlikely. : If the once monthly sexual encounter occurs outside of your ovulatory period (10-14 after previous period), and you use condoms and oral contraception consistently, your chances of conception are extremely low.

Extremely small: The cumulative effects of condoms, oral contraceptives and limited intercourse makes pregnancy highly unlikely. However, it is not zero, so if you have concerns it is always best to take a pregnancy test.