It is possible that your bump at 7 weeks could be a sign of twins, especially if there is a family history of twins. While it skipped 2 generations on your mother's side, genetics can still play a role in determining the likelihood of having twins. However, it is important to note that the only way to confirm whether you are carrying twins or not is through an ultrasound scan. This will provide accurate information about the number of embryos present. If you suspect that you might be carrying twins based on your family history and physical changes, it would be best to consult with your healthcare provider who can arrange for an ultrasound examination to determine the exact number of babies you are expecting.