I Am Very Concerned At This Moment . I Am

I am very concerned at this moment . I am 18 years old and i have been having unprotected sex with my boyfriend( Stupid of me i know) but im scared i might be pregnant. My period hasnt come all the month of december and i took a test on new years eve and it came out negative when i went back to see it again there was a thin blue line thru the middle marking it a positve. Am i pregnant ?