Is the birth control still effective during the placebo week?

Jessica • So in love 😝 it's actually gross
He accidentally came inside. I'm on birth control so I usually don't freak out that much but I'm in the placebo week and I haven't started my period. Does anyone know the chance of me actually being pregnant? Has anyone else had sex in the placebo week? Is the birth control still effective during the placebo week? When should I take a pregnancy test?