Well, your gynecologist should have told you, or you should have read the instruction packet of your Birth Control pills, and it will tell you that if you miss 3 pills consecutively in one month, to throw that packet away and start a new and use a back up form of contraception for one month. Any time you are taking anti-biotics you should use a back up form of contraception because it keeps your birth control pills from working properly. So it is quite possible that you could be pregnant.