Why is my period late now?

I had protected sex, and had 8 or 9 regular periods after that and not had sex since, this month I am late. what could this mean??

How old are you? Your menstration cycle doesn't get onto a solid track until your about in your 20's. Most likely it will start soon. If you haven't had sex and had periods before then there is no way your pregnate. Just give it some time and it will hit.

i am 23 years old

Dear cheekychick,
Well the odds are your not pregnant. But the stress could be causing a irregular cycle. There are many, many reasons our periods get messed up some months. If you continue to have irregularities see a doctor. Even if you are having protected sex there is always a chance of pregnancy.
Sue...good luck

i could just mean your late on your period.

it could be that you are stressed because when you are stressed your periods get irregular