Most doctors and pharmacists, in the interest of precaution, will tell you to use a backup method until the end of that cycle, or 7 days, if your cycle ends before 7 days is up. For those on the 21-day cycle (which does not include the 7 days of placebos at the end), they generally just say 7 days from when you stop the antibiotic. We get this question in the pharmacy all the time, and that's what every pharmacist i've ever worked under had advised of their patients.
Regardless of the small chance, there's just no point in telling someone to go ahead and get freaky when a simple precaution could be taken for a few weeks. As annoying as it may be, it won't kill anyone to have to wear a condom for 2 weeks or so during sex, especially when it's for the reason of preventing pregnancy.
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