I have been on antibiotics for a really bad spider bite for about 5 days now & still have a few more days left of taking them. I know that antibiotics cancel out your birth control, but I've been on the placebo pill & on my period the this past week. I start my new pack of birth control tomorrow. About how long should my boyfriend & I use condoms before being inthe  clear?? We definitely are not ready for babies just yet. Thanks!