Hi I Want To Ask,i Finish My Contraceptives Pills Last

Hi i want to ask,i finish my contraceptives pills last week and im expecting my period,but its only dark brown spotting came out,i have sex with my husband 1 day before my bcp finish,is there a possibility that im pregnant,im just worried because i finish one pocket of bcp and i only have dark brown spotting on my expected date of my period.thank you and pls help me what to do.should i check it hpk? Thank you