what is going on?!!

Deja

i normally have regular periods. anywhere from 27-29 day cycles. and they always last 5 days. i always get mild cramps leading up to my period and throughout. but this cycle, my period came 5 days late. by the end of the first day it seemed like i was already ending the period. which is very strange for me. it's normally heavy the first two days then gradually eases up. i also had absolutely no cramps whatsoever, which is also unheard of for me. i don't believe i am pregnant bc i took a test at 3 days late and it was negative. i have no clue what's going on. any insight is appreciated. thanks!