On Saturday, I took my birth control about an hour and 10 minutes late. I take Microgestin Fe 1.5/30 and have been taking it on time all the time, I was just at a friend's house and had forgotten to take it with me when we went to dinner. I had sex 4 days later, using a condom. It broke half way through and we just continued without it. Although, he pulled out in plenty of time. Should I be concerned or take a plan B pill??