It is true that antibiotics can hamper the effect of contraceptives, but, as your course is over now, there should be no need for further protection. Yet, to be on the safe side, I recommend additional protection for this month. It would suffice if you use barrier methods
. Also, if you take the pill and the antibiotic on two different occasions during the day with a reasonable gap of at least 6 hours in between, there would be very little impact. Hope your query has been clarified. Wish you good health.