If your period is usually 6 days if it last only 2 is something wrong?

Depends, if you got your first period within 3 years ago, then it's nothing to worry about. It is very irregular during those years. Sometimes it's super heavy, and sometimes you don't notice it because it's so light and short. Sometimes it will last a week, other times it may only stay a day or two. Occasionally you might skip a month or two, but there's nothing to worry about unless you're having sex. Once I got it twice in one month. So you have nothing to worry about. It depends on your age. If you are menopausal then you may just be spotting after your actual period.