I'm 18& Might be pregnant might not?

So I'm 18, I'm very much so sexually active. I do use condoms. My period is 3 days late but I do have a pregnancy test, I don't want to take it yet cause I don't want a false negative or something. Should I be panicking (as I am) or are late periods okay? & is it too early to take the pregnancy test? Thanks
I'm 18& Might be pregnant might not?
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