Baby fell off changing table

This has been the worst day by far. I swore I had my hand on her sturdy enough but she is so slippery and fast that she fell right off the changing table. She fell on her front and immediately started screaming and I started crying. Called the pediatrician and they said as long as she hasn’t lost consciousness, isn’t vomiting, has no bumps, bruises, bleeding or other obvious injuries then she is probably fine. She calmed down way before I did, lol. I feel like such a terrible mother. How could I let this happen??? I’m usually so careful. I feel sick to my stomach.

Edit: She now has a bruise between her eyes.