Normal or not ?

Julie
So on a regular cycle my period lasts 3 days (been that way for 4 years now) but for some reason this month's period has lasted 7 days today. My first three days were the usual, 1st day light, 2nd day heavy, 3rd day light. But after the 3rd day it's almost like a super light flow. My period NEVER does this! I'm not really sure why I'm still bleeding, if anyone has had this happen and knows why PLEASE EXPLAIN WHY! I'm just worried at this point 😞