Very short period

Erin • In love with the most amazing man in the world 10.20.12 ❤️
My period lasts all of 4 days 
​Is this normal
​1st day very light spotting don't even need a tampon 
​2nd day light flow heavy spotting 
​3rd day light flow covers half the tampon
​4th day ligh spotting don't need a tampon