Birth Control and Antibiotic, one pill.

Patient: Hi I was recently put on antibiotics about Oct. 21. I think Dicloxacillin I am not sure it was for a skin infection. I am on birth control, my doctor told me to use back up for 7 days after taking the antibiotics. My boyfriend and I have been using protection up until this weekend. My period had just ended. However, around Nov. 10 I thought the infection was coming back and had made the irrational decision to take one pill (I had a pill leftover from the dose) Would this affect my birth control? I started a new pack the Friday after taking the lone antibiotic