Morning after and bleeding nightmare...can anyone relate ?

hey everyone. so in the last 4months i have needed to take a morning after pill 4 times... (i am unable to take regular contraception for other reasons ). my periods ha e always been heavy but consistent and predictable. following the last two MAPs (both taken in last cycle) this month i have had a period of 5 days which the doctor deemed normal however my expected period jas been beyond heavy and i am currebtly on day 27 of bleeding ! my gp thinks the bleed may not be related tot he map and so i am being referred for tests however i was wondering if anyone out there has any advice or experience regarding this as not only am i panickimg but also wondering if it could be something more sinister. thanks in advance