Help!!!!

so I’m technically supposed to have my period til Tuesday but last night I was barely bleeding so me and my boyfriend had sex... and he came in me. I’m on the pill and I take them perfectly give or take a few mins... but I was on the sugar pills this week. I’m having a panic attack and idk if I should take a plan b or if I’m protected... I hear so many stories about girls getting pregnant while on birth control so I’m legit freaking tf out