Worried

My boyfriend and I have sex and use the pull out method and its always worked for us but I know that since we don't plan on having kids for awhile we need to switch over to a more reliable method. I am really in need of support right now. I don't know why but lately I have been a ball of anxiety, and i find it's harder to enjoy myself whenever I am worried about getting pregnant. It's not like I wouldn't want them, but I definetly want to be able to provide a better life for them than I would be able to do at this age. My period was supposed to come today, nothing. Also no period symptoms or brown discharge like I usually get... Probably will take a test in a few days but am feeling scared/shamed  about buying one, even if my boyfriend is right there with me.