16 and pregnant?... PLEASE HELP

So my boyfriend and I had unprotected sex (no condom/birth control I know it was stupid and in the moment and we both agreed never to do it again until I'm on bc) on December 20th and yesterday I woke up really sick... I felt like I needed to throw up and I felt so cold and I had a sore throat and everything just hurt so bad, and then today I woke up and I still feel really sick but it's not as bad as yesterday.... my period  won't be for at least two weeks I'm scared... could I be pregnant? 

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