Patient : I was late on my Yaz pill two times in the past week, but not in a row (about a week apart). I did not completely miss it, but took it 5 hours late the first time and 9 hours late the second time. I'm at the end of week one now and have been taking birth control consistently since august (seldom late on a pill). Do I need a plan B pill or back up contraceptive? What is my chance of being pregnant having otherwise unprotected sex the second of the days I was late?
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