Might be pregnant @ 16/telling my parents!!

Okay so I had my period one week earlier than usual after unprotected sex and am 6 days late on my second. I have looked at my symptoms and am going to buy a pregnancy test tomorrow, but here's the thing... I'm 16. I hooked up with a friend in June without either of our parents knowing and neither of our parents know that either of us are sexually active. I am Christian and so is he so idk how to tell my parents. I've read blogs about girls who get pregnant at 16 but most are dating the guy but I'm not so it's different. Me and him haven't hung out since so idk how to tell him I might be. I'm also a 3.9 gpa student and top 8% rank and am going into my junior year of high school and no one at my school is pregnant. Help!