My DH put our 6 week old DD on the edge of the bed and she fell off. She started screaming and had a big red mark as well. She's now 3 1/2 and fine. Take her to the doctor if she isnt feeding/ doesnt settle down, try to keep her awake for awhile to monitor her. Im sure she will be fine There will be so many times when things like this will happen even with the best intentions, its just a learning curve and accidents happen no matter how careful you are as well. Dont beat yourself up, youve got the rest of her life to do that so save your energy!!