I'm on birth control (minastrin) and during my 4 days of the brown pill i received one day of very light spotting...am i pregnant?

Normal, not preg: If you took the pills consistently, one would expect to get a period during the brown or placebo pills of a BCP. Sometimes this can be very light with only spotting or it can be heavier and last up to a week like a regular period. If you keep taking the pills daily at about the same time, it is unlikely that you are or will get pregnant. Condoms add both STD and preg protection.