Re: missed 2 bc pills and am now bleeding
there is no specific "statistic" that can tell you how probable it is that you are pregnant. if you missed two consecutive pills and did not use back-up, your chances are obviously greater. i would continue taking the pills as normal and see if your period comes again. if not, take a pregnancy test.
as for the withdrawal bleeding, it should only last a few days to a week if you get your body back on the schedule.