Bottom line, she should take a pregnancy test. A week's not too early, regardless of the oddness of the symptoms (back pains can be from a number of things, not just extra weight). I don't know for sure, but I think paternity can technically be tested in utero, but they usually wait till the baby is born unless there's some other reason to do an amniocentesis, which does pose a risk to the mom and the baby. And is usually done much later in the pregnancy, I think.
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