I'm 16 And I've Been Having Unprotected Sex For The

I'm 16 and I've been having unprotected sex for the last 6 months, I was on birth control but stopped taking my pills a week ago, I last had intercourse on Thursday with my boyfriend and started taking the pills onwards to this day, last night I also had unprotected sex and took my last pill today.. I feel so exhausted and tiered, I don't want to eat either, I'm really nervous and scared that I could get pregnant, is there any chance it could just be the pill? I may sound silly but helpp?!