First of all, why is this question in Yahoo music?
Secondly, I saw you ask this three times, the answer has not changed. A girl who has not had her first period CANNOT GET PREGNANT! She's simply not fertile yet.
You asked essentially the same question three days ago. Someone gave a good answer. The answer hasn't changed since then.
Please don't ask any more questions until you have finished reading
Campbell Biology, 7th edition or newer
completely. You need to read it from cover to cover.