really long period

[diamondday.livejournal.com]

My period has been going on for almost two weeks now...it normally only goes on for around 5 or 6 days, and only fairly heavy for two or three days. I'm usually regular at 26-9 days, but it was 10 days late. I've just starting take BC pills, I started taking microgynon on the day it started, as per my doctor's instructions. Perhaps this has caused it? Or could there be some other cause? Should I be worried ?(my boyfriend thinks I should go to the doctor)