Should I take a pregnancy test?

My boyfriend and I had sex on NYE, a few days before my period. I got that period, but now I was supposed to get another one yesterday and still haven't gotten it. I don't really feel it coming either, and I've been pretty nauseous since Sunday but it may just be because I'm freaking myself out, I'm not sure. I'm a senior in high school so I'm obviously not ready to have a child. Should I take a test or am I worrying too much? I heard you should wait a week after your missed period for the most accurate results, so do I need to wait to take one? I'm so scared 😔

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