Do I face prison for possession of firearms and why?

My home was being remodeled and I had to temporally stay with my landlord. He had guns. I have 2 prior felonies. The gun was found on the back porch hanging by the deputy sheriff in Fairfield, Iowa. Since my release from prison all I have been doing is concentrating on being a law abiding citizen, to be successful in life. I recently graduated for college with my associate’s degree for business management to further my chances to be successful person. I did not touch the guns and had no intentions to possess any of them. I was merely in a living situation and did not pay attention to the law of being a felon. I honestly forgot I am/was a felon. When I was in prison all I thought about was going back out into society and being a productive, law abiding person.