Family Planning Plus

Yes, it is possible that you ovulated since you did not take at least one full week of birth control pills prior to the sexual intercourse. You need to take a full week of pills in order for the hormone level to reach a point that suppresses ovulation. The fact that you were also taking antibiotics during your first week of birth control pills is besides the point.  Keep taking your pills. Wait at least one full month after restarting the pill, and then take a pregnancy test.  Repeat the test every two weeks until you get a period or you have a positive test result.  Of course, if your result does come back positive, you will need to stop the pill. Good luck.