So I was on Aviane(birth control) and began taking antibiotics (cephalexin) on the 19th of November with was my second day of my placebo pill and stopped taking antibiotics the 29th but also began taking Ortho tri cyclen the the Wednesday after the placebo because I switched birth controls. How long do I have to wait. It's been two weeks since that.. I've used condoms since then.. When am I safe.