Army crawl down stairs

My very big 6m old baby just army crawled/assume fell? Down 4 carpeted stairs. I was getting a onesie and she left the room she was in so fast. She cried and was on her belly. As soon as i picked her up she stopped crying. She is acting normal and moving around. I don't see any red marks or injuries. Will she be ok? Im not sure she slid or flipped?