worried guilty panic

My 6mth old baby rolled off the bed and landed on the floor!!!!!! She didn't cry screaming it was a different kind of cry like soft and short cries with no tears, after I carry her for a few mins she was back to normal. the top right of her head no bump but red red. I'm so guilty and upset I didn't see her well enough!!!!! I just went to take some long pants for her it was less than a minute. I feel terrible and so scared right now. my husband say baby is fine as she is still smiling and laughing. but im worried will have brain damage or inter bleeding????? PLS ADVICE