period or implantion

ok i start my period 3 days early then for a day an a half then it lighten up its redish pink knoe an i have no cramps but my period is really light an this has never happend to me its confusing i mean when i did start my period the 27th its started as pinkinsh an not alot then i was only beedling a lil but its period bllood then the nect day it was heavy then the next day with is the 29 it was light but still a lil havy now its beyond ver light an i mean light light its worrying me wat cuold it be plz help its confusing i dont feel [regnant but i dont know anymore