non stop bleeding 11 days

Hey... I have been using femilon...the birth control pill for 6 months now....last month i tired to skip my periods...so after i finishd my first pack...i directly started the next....after taking 5 tablts from the next pack...i started bleeding....and it went on....i stoped takin the tabltes 5 days later.....now its been 11 days...and am bleeding non stop and very heavy.... Do i need to b worried?