Weird feelings in my abdomen but not pregnant or constipated. what can cause pressure down low?

Bladder problem?: When you say pressure down low, that makes me think you may have bladder issues. Your bladder is located just on top of your pubic bone. Otherwise, down low may be related to uterine sensations as well. Fibroids can cause pressure too. One cannot rule out intestinal issues as well. See a physician and they can perform an exam and rule out anything serious.