Weird period

Okay ladies i need your help! Usually my periods are about 6-7 days long, bad cramps the first day, and heavy flow until my fifth or sixth day. This time i didnt get cramps until the second day (they werent as bad as usual tho) and im on my fourth day rn and its really light and its that dark brown color that usually only happens on the last two days but on my fourth day of my cycle. Any body know what could be going on?