You can’t tell if you’re pregnant or if you’re about to have your period just by the symptom of swollen breasts. Whether you are pregnant or about to have your period, hormonal changes will occur in your body and you may experience breast tenderness, so there is no way to tell if you are pregnant or about to have your period based on this one symptom alone. If you are a few days away from your period and want to determine if you are pregnant, you can take a blood test to check for HCG, and if the result is positive, you may be pregnant. However, if the result is negative, it does not necessarily mean that you are not pregnant. It is still early in the test, and some embryos may not be detected because of their late development. Therefore, if you want a more accurate result, it is generally recommended to take the test one week after the menopause, and the result at this time is more informative.