You sound extremely young. If you have yet to get your first period, meaning you have NEVER had a period; you can not get pregnant.
DETAILS: Providing the fact that you have not yet started to ovulate. If you have sexual intercourse on your first ovulation, between 3-4 weeks before your first period, then yes you can become pregnant.
Now I want to know why the heck a little girl is asking this. As far as I am concerned, you're supposed to be playing WITH DOLLS.