The only way you will know is waiting a little while longer, and either see a doctor, or buy a home pregnancy test kit.
You don't say how old you are, but stress and anxiety over what may or may not be, could contribute to some of the symptoms. You could also have a 'bug' contributing to some of this.
Maybe a better idea would be just to see the doctor anyway, to set your mind at ease, if these symptoms persist.
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