What happens if i skip taking the placebo pills and start right on the next active pill back? will i skip withdrawal bleeding?

Some physicians will prescribe multiple packs of "active" bcp's without a "break" for the week of placebo pills. See your GYN physician for guidance, but when taking two or more packs just using the active pills is not harmful, and will eliminate breakthrough bleeding unless you are not punctual in taking the active pills at the same hour of the prior day's active pill.