No two women are exactly the same. Your period or cycle won't necessarily be EXACTLY like anyone else's.
From On the Rag:
It is perfectly normal to have a menstrual phase that lasts anywhere from just a couple days to seven or more days, and both light and heavy flow, or a combination of the two, are both also normal.
If you're worried about it, ask your doctor the next time you speak to him/her.
Scarleteen Advocate (and Labia Lady)
"The whole world is full of morons...they just congregate on the internet cause it's easy for them to push the buttons."