What can cause a very dull ache few inches to right of belly button, 1 month, not constant no other symptoms. Abdomen not tender & feels normal/soft

Many things. Many things can cause this kind of symptom. For example issues with your gallbladder, congenital problems or previous surgical procedures that are causing the bowel to become more narrow, meckel diverticulum, kidney stones. But there is no way to know without a thorough interrogation, physical examination and probably laboratory or image studies. .
Can't tell. Hi, your symptoms are very inespecific. Please go visit your primary care doctor.
Inespecific . We need more info. .