I have a dear friend who had a miscarriage four weeks before taking a preg test. Using a digital test it indicated she was 3+ weeks pregnant. She has had some spotting, old brown blood, over the two weeks since doing the test and is concerned about another miscarriage. Is it possible her body is still carrying chemicals that the test is reading and indicating a pregnancy? Could she not be pregnant but is is the chemicals in her system from the last pregnancy which give are giving a positive result? What do you think?