My baby fell off the bed 😭😢💔

So yesterday I laid my baby down for a nap and starting cleaning... she’ll be 5 months on the 18th and she starting rolling over at 3 months FYI. So I went and started cleaning and I hear she fell and started screaming. I’ve never felt so horrible in my life. I cannot stop thinking about it. I feel like a horrible mother. She must have scooted her self to the edge and fell 😭 please tell me this has happened to other babies and not just mine because I just want to sit in a corner and cry 💔💔💔💔💔