Urgent Help.

I am very stressed out, and I really need help with this. I am on the pill, and recently had my 17th birthday Dec. 3, in which my long distance boyfriend came to my house. He just turned 19. We were having unprotected sex, and I was taking my pill regularly. Until one night (Dec. 5), I forgot. I took it about 3-4 hours after sex (woke up around 3 AM, took it around 5) is there a possibility I'm pregnant..? I need serious answers, as I am very nervous..