Morning sickness?

So I've been relatively sick-ish the past week. Like, anytime I'd eat I would feel nauseated. Not enough to throw up usually but I'd feel the need to. 
I've been blaming it on the meds I got put on about a week ago because it started about the same time. There shouldn't be much of a chance of me being pregnant because we've been safe, though I'm not yet on birth control.
Im supposed to start my period any day but it's been up to two weeks late before so idk.. Should I go buy a couple pregnancy tests? Or am I just worried over nothing? I'm not ready to have a kid, I can barely take care of myself let alone a mini me

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