[Gray]

I've heard people say that in order for the birth control pills to be completely effective, you need to wait a month after starting them for the first time. However, people say that it is effective when starting a new pack right after your period.What is the difference? What causes this to be the case? How come you don't have to wait an entire month after each period? (If that were the case, no one would even bother with birth control).

[perisholisa]

because the pill doesnt start to take affect for a least a couple of weeks, that is why they say to wait at least a month before you use it without backup. either way it would be the same, wait till you finish your pack before using it alone.