Hi. I agree with Shisslak. She gave good advice mentioning that you should have been educated on using secondary precautions while taking the antibiotic and maybe considering a pregnancy test before taking more contraceptives. Two weeks after your final does is questionable. Depending on the antiobiotic you took, it could stay in your system for a short or longer period of time. The half life ( the lenght of time it takes for half of the antibiotic dose to be eliminated from your system) can be from hours to days. For instance Penicillin taken oral has a half life of 2.5 hours and if injected it has a 14 day half life. Good luck and take care. Alice