My body is fucked up?

My period started 3 days before it was supposed to, And it started offf super dark and light. Day 2 was regular color red and pinkish and day 3 went back to really dark. All 3 days it was a really light flow. It only filled the tip of a tampon. It only lasted 3 days. And im always heavy and lasting 5 days. Has anyone had this happen and did you find out the reason?