Pregnant?

So I take the birth control pills.. and I ran out becuase i was expecting to get the bar that following week so I wasn't worried about refilling the pills but instead they made me wait at least another month so I started taking the pills again... about a week maybe less went by that I was NOT on the pills and had unprotected sex no birth control methods.... my period is now 2 days late... could I be pregnant? Should I be worried ?