pregnant????

i’m 16 and scared. i’ve been on birth control for about two years now. my boyfriend and i have had sex and he said he came in me. i started my period today when i got back from school around 1:50 , and i put a tampon in around 2 and then i took it out around 9-10 barely anything was on it accept for like brown discharge i think. is that normal or am i pregnant.