I Was Wondering If It Was Safe To Start My

I was wondering if it was safe to start my birth control one day before the placebo pills are finished. I want to move my start date (of active pills) up from Saturday to Friday. So instead of taking the final sugar pill of my last pack on Friday, I would just start the new pack. I am taking the 21-pill Kelnor right now. I have only taken these for one month so far. Will I risk pregnancy if I do this? And what about break-through bleeding?
Thanks!