Are you saying that you had unprotected sex, and then two weeks later had a period, and are wondering if this indicates you are not pregnant? A period is the classic sign that you are not pregnant. Some women can have bleeding in early pregnancy, but it is not usually something you would confuse with a period.
WHAT DO YOU MEAN NOTHING HAPPENS........
Im not sure what your asking? are you asking if your pregnant? a woman tends to ovulate approx. 2 weeks before ovulation... but you shouldnt be having sex anyway at such a young age... especially if you dont know how your body works...if you are having sex use protection!