Hi @samanthawagner14, I did the same thing to my shin about 5 years ago. I was walking in the dark between two parked vehicles and tripped over the tow hitch The dent stayed for over a year. My doctor told me that I hit it so hard that I damaged the muscle tissue in my leg and that it was going to take quite a while to heal. Now that was my situation, so yours could be different.
There is a discussion surrounding leg muscle dents, but I wanted to leave your post separate from this one since your dent was caused by a fall.
You can read it here though:
"Dents" in leg muscles:
https://connect.mayoclinic.org/discussion/dents-in-leg-muscles/
I hope you get good news at the doctors office tomorrow. Let us know the outcome.