missed period; please help

so about two weeks ago i had protected sex with my bf and he would pull out before he came. he checked to make sure the condoms were not broken. a couple days ago my period was supposed to arrive and it's still not here. yesterday i did a pregnancy test and it came out negative. i've never missed a period before. is this normal? why else, other than stress, would i miss a period? what should i do?

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