It's possible that you can experience some of those before a period as well. Periods can be off from time to time especially in the teen years. Have you had nausea before with a period? It is also possible that you have an illness.
Certainly if you've been having sex, pregnancy will be a possibility. See what happens with the bleeding. If it lasts about what your normal period lasts that is most likely what it is, just a little early, which again is not unusual.
If after, you continue to feel possible symptoms, either try a pregnancy test at home, following the directions carefully, or see your doctor, health department, or a pregnancy center for a test.
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