HELP MEEE PLEASE!!!

I know it's late right now but I can't sleep and it's driving me crazy. So my boyfriend and I had sex a couple hours ago (so yesterday) and we did the withdrawal method. My period is suppose to start this week but it's irregular so maybe not. But he swears he pulled out before any sperm got inside. But I'm just freakin out whether I should take plan b or just wait and see, because I'm a teen and my parents never thought I would do this and their not gunna know. So I'm freakin out like big time!!! I have a job but it only pays minimum wage and my bf doesn't have one so we don't really have any money?! What do I do take plan B or wait it out?!?!?? HELP ME PLEEAASSSEER 😩😩😭