Brief thing of note - the Pill is 99% effective if used exactly as it should be. Which means if you do everything the box says and get it right all the time (which plenty of people don't, as everyone has off days), there's still a one in a hundred chance you could get knocked up the next time you have sex. Same goes for all contraceptives, really. They do work, almost all of the time, but some folks are just unlucky.