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The symptoms of pregnancy are very nonspecific meaning its not necessary that when you have these symptoms that you are pregnant.
Hormonal changes as a result of anything like extreme emotional or physical stress can also cause these kind of symptoms.
It would be be highly unlikely for you to be miscarrying because you are having these symptoms even before your periods were due.
If your symptoms are severe I would recommend that you should visit the emergency to make sure everything is okay.
If your symptoms are mild to moderate then you can try consulting your GP.
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