Question #2) What if your period which is supposed to come on the 4th week actually arrives in the 3rd week for some reason? Should I start a new pack now?

Question #3) Will the effectiveness decrease if I don't take the pill at the same exact time each day? For instance, what if instead of 12:00pm, i take it at 12:45pm the next day and 12:10pm the following day, and 12:30pm the day after that??