What Causes Persistent Dull Abdominal Pain?

I ve been having dull, mild-to-moderate pains in my lower abdomen, around my bladder area and a little higher up close to my stomach area. The pain in my stomach area is very minimal and does not occur often. I notice more pain when I m active, like at work or walking around more, but the pain is not intense; just a dull, uncomfortable feeling. I have had blood when I use the restroom going number 2, but the blood is NOT mixed in the stools. I m worried about this and would like a professional opinion on what this could be before going to the doctor or emergency room. Thank you.