idk what to do

im 15. me and my boyfriend had unprotected sex a month ago, but he pulled out. then, a week later, i got my period. it was normal, nothing was weird about it. we havent had sex since then, but i have some light spotting and brownish discharge, which i looked up and it said it could be implantation bleeding. is there any way i could be pregnant? and if so, what do i do? i cant tell my mom, she would actually kill me lol