Pregnant

Okay I just need to get this out. There's not really anybody I can tell that I know. 
I'm turning 18 in four days. I had sex with my boyfriend exactly one week ago, and now my period is two days late. 
I wasn't paying attention to my ovulation and what not. Tbh I didn't even know what that was until just now. 
He has NEVER cum during sex for anybody! And I know very well that you can get pregnant from precum. 
I guess I just needed to get this off of my chest. I just don't know what to do. 
I have a pregnancy test at home which I'll arrive home tomorrow. I'm just scared and needed to tell somebody.