Doorbell Chime Going Off

Hi Everyone,I’m new to Ring it’s been about a few weeks now anyways i’m wanting to know if anyone on here has had the doorbell chime go off & you check the notification but theirs know one their but it goes off. I was wondering if it could be the movement of my car cover that is setting it off but i have found that it isn’t & the chime keeps going off & not seeing anyone their so can anyone HELP!!! Thanks in advance K