im supposed to get my period tomorrow and im scared that its not going to come

Hello ,Im 16 and Im scared to def that i may be pregnant . My boyfriend and i had sex on Jan.12.13 and today is jam.23.13  its been a week & 4 day since then . it was unprotected , but it was less then 5 mins because i got really scared & just asked him to stop........ ive been feeling normal . fine as ever , just stressing a lot . but today something bad happen . out of no where my breast started to hurt . and i don't know if im just thinking that they are because when i touch them it doesn't hurt . And im supposed to get my period tomorrow and im scared that its not going to come . My parents are very judgmental And im scared to tell them & even  scared to go to the store to get a home pregnancy test . My boyfriends parents are very religious and probably would never speak with me again. i just need help & advice ASAP :(