False negatives preg test?

i am 20 years old and my bf had sex with me and came inside me on june 26th..i had my normal period in july, but missed my august period which has never happened.. I took 2 cvs brand preg test and both came out negative 2 days ago. I woke up this morning feeling SO and I mean SO nauseous where I had to leave school early. is it possible that the preg test was a false negative or what should I do?
Asked Sep 03, 2014

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