HELP ACCIDENT

So i started my period on friday the 28th and on monday the 2nd my boyfriend and i had sex. (still on me period during sex) i haven’t been on any pills or anything. and we used a condom but it broke. i never let him cum in me so he pulled out and he said he was out of me before the cum out but it still worries cause what if he couldn’t tell. also not worried about precum because he peed right before sex just to make sure there was no left over sperm in him. i’m freaking out about being pregnant because i’m only 17 and my mom doesn’t know we have sex and doesn’t approve. obviously plan b is what came to mind first but do y’all really think i need to just cause i don’t have the money. to pay for it. please helppppp!!!