I had Chlamydia before and I was given 1 pill and the dr said it would last in my system for 2 weeks. I would say your medicine is probably still in your system, but you might want to mention that to your dr just to make sure they don't want you to take more meds. I'm not sure if a second exposure after you have already taken the medication would put you at risk of getting it again or if the medication would shield you from it. Just check with your dr to be sure!