It is possible to have a negative result on a home pregnancy test at 8 weeks 2 days, although it is less common. There are several reasons why this may occur, such as taking the test too early or not following the instructions correctly. If you are experiencing back pain and abdomen pain along with the negative result, it is important to consult with a healthcare professional for further evaluation. These symptoms could be related to various factors such as hormonal changes or other underlying conditions. A healthcare provider can perform a more accurate pregnancy test and assess your symptoms to determine the cause of your discomfort.