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The symptoms that you mentioned can be due to pregnancy
, but they are not specific, so nothing can be confirmed. Since you are not using any protection, you may be pregnant. Do a pregnancy test at home anytime after the missed period to confirm.
Your symptoms say that you have been quite unwell, which is unusual at such early pregnancy, so i suggest that you consult a doctor.
Till the time it is confirmed that you are not pregnant, i suggest that you avoid alcohol.