Period problems

So on Christmas eve i started bleeding for about 5 hours bleeding very lightly and no clots and i was cramping i was going back and forth between if this was my period or implantation bleeding for the next two days i did not bleed at all after the two days so thursday i started bleeding again which obviously since i started bleeding again means its my period. Ive been bleeding ever since Thursday and it wont seem to stop which is strange for me because normally my periods only last about 4 days... Not sure if should be alarmed or not?