As I got closer I realized the object was a small mouse.
How did you feel when you saw the mouse?
I felt so disgusted by its movement.
It's understandable that you felt disgusted. It's important that you call a pest control company to look for rodents if you are not sure what to do. Rodents carry diseases and they can bite.
I didn't know that. Now I understand why I wanted to kill it.
It may be unfortunate to end a life, but it's only for your safety so it's good your instincts told you something was off! I think everyone in the house would be happy you found this pest problem, and no one will get sick from it.