How To Avoid Pregnancy?

hi, im 15, i was having dry sex with my boyfriend and i am affraid of the consequnces, he was not wearing protection he was in my boxers and i was in my underwear, i usually get my period around this time and it happened sunday around 2am is it possible for me to be pregnant? i need advice i cant tell my parents,

what are the risks of taking plan b if im under the age of 17?

please dont judge ..this was a mistakee