someone's at the door...

i woke up in the middle of the night to some rattling. i wasn't sure what it was because i had a fan on. i woke up, went to the bathroom and heard more rattling. it sounded like it was coming from the door. i got scared and went to my parent's room. we got up and went to the living room to check the front yard. our outside sensor light was on. also, my dad and i saw a car w/ its headlights on and it left. i'm still a bit freaked out by this incident.