Thanks for your question.
Periods may come as late as 10 days which is also normal. At a young age due to stress itself, the hormones may be deranged and so may be your menstruation. So worries over there .
It is good that you think about not taking responsibility of being a mother at such a young age. So whenever you initiate sex , always 'condom' it, it will save you from getting STDs or HIV as well as from becoming pregnant.
Hope this helps.
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