Pregnancy scare ?! Depo shot

So recently about three months ago i started the depo shot after a year of already being on the pill. Me and my boyfriend at the time i had been with for awhile wouldn’t use protection. we just recently broke up and i missed my period this month by 17 days today. i don’t know if it’s just a missed period because if he shot since my bodys adjusting or if i’m pregnant. it’s my first scare and it’s stressing me out the to the max. i know it might sound dumb but i’m underage and my biggest fear ever is having kids because i’m just simply a person who doesn’t want to have their own especially this young. today i’m going to get a few tests and see because i’ve been to scared to even test myself yet just the thought i might even be pregnant keeps scaring me but the 14th i’m going back to get my shot again and their obviously going to test me. i’m just really alone at this time and i have no clue what i can do because if i tell my family their going to freak. i live with my great aunt n uncle their in their late 70’s and ones 85. heavily christian. and i have no one to reach out to or talk to this about so maybe someone could talk to me. shit