I would say it's normal to be a little scared of something like this. If there is a spirit, it could have many different reasons for being there. If your uneasy because it's there, and not because you sense something evil or terrifing coming from it. I would say it's probably not there to cause you harm. if you feel the hair stand up on the back of your neck and feel something sinister, i would be concerned. I'm not real knowledgeable about spirits. so my sugguestion is to make sure you keep yourself, family, cats etc. protected at all times.