If you have missed your period for over a week and are experiencing symptoms such as cramps, itching breasts, and pain around the armpit, it is advisable to take a pregnancy test. These symptoms could be early signs of pregnancy, but they can also be caused by other factors such as hormonal changes or premenstrual syndrome (PMS). Taking a pregnancy test will help provide clarity on whether you are pregnant or not. It is recommended to use an early detection home pregnancy test kit for accurate results. If the test comes out negative and your period still hasn't arrived after a few more days, it is advisable to consult with your healthcare provider for further evaluation. They can help determine the cause of your symptoms and provide appropriate guidance or treatment if needed.