help please

mia

i’m so scared that i might be pregnant. i haven’t had my period in maybe a month. my friend said that having a lot of sex can change your period. i’ve been having brown spotting on my underwear and idk what’s going on. my bf has checked for holes in our condoms and made sure all his cum was in it. and he said i would’ve felt it. i’m honestly crying so much and i’m still a teenager and i want to do big things in life. please please help me.