C.G.
The current practice recommendation is that most antibiotics do not affect birth control pills. The exceptions are isonizid (used for TB) and one other that I can't remember off the top of my head. As a rule of thumb, if you do not experience any diarrhea or vomitting due to your antibiotic then you are probably safe as far as protection. Check out your birth control company's website for the latest on this because it is new information but you probably don't need to worry.