Don't worry about it until you observe a problem. Damage to components is not overt. Open it up and check that everything is still plugged in. Things can get jostled around, but newer hardware is pretty resilient. It could be worse if it was running when it fell, but could still easily be fine. Some important things are the 24 pin power cable, SATA cables, CPU power cable, front panel button power cables, graphics card power cable (reseat it on the PCIe slot if you're having problems later on).
Try to backup your personal data incase the drives got damaged and watch for visual artifacts and crashing. You might have zero problems.