missed period

i am 15 years old and me and my boyfriend have had sex. yes it was unprotected too, but the thing is it only lasted for like 5 minutes and we was still hard after and did not cum yet. my period is 8 days late and i am freaking out. i have no one in my family to talk to about this. what should i do ? i’ve been very stressed about my missed period, could i have missed it because of that ? what are some symptoms to early pregnancy... please help .