prolonged menstruation

hey girls!!

i really need some advice from you all regarding my prolonged menstruation..

i have pcos n my periods were not regular 3 months back..so my gynaecologist prescribed me birth control pills for 3 months.. and now after this cycle i am not supposed to take the birth control...

my periods usually last for 5-6 days n now it's almost 7 days after my 6th day of period i am still bleeding 😕 i can't say it's spotting...but does anyone have any idea that whats the reason behind this..n yes since 4 days i am on heavy dosage of medicine for viral fever..

please girls suggest something..