My wife is on BC but is also on the end cycle of antibiotics for strep throat. We were told that the antibiotics could weaken the BC... During intercourse I exited prior to ejaculation. But, to be on the safe side, no more than 2 hours after intercourse she took the Plan B pill... With the combined current use of BC and taking the Plan B, and exiting prior to ejaculation, what is our opinion of likelihood of pregnancy?