Sunset UFO

Decided to try out my new DLSR camera recently and thought I would get up early to try and capture a photo of the sunrise. However, when I put the photo up on my PC to edit, I was amazed to see the image in the top left hand corner! Definitely did not see this at the time of taking the photo! Not sure if the contrail is from an airplane or something else. Really weird! We are definitely NOT ALONE!