It would be unusual to break the implant with a fall.
It is easy to diagnose rupture saline implants, because they deflate and the size change is obvious. However, physical exam in an unreliable way to detect ruptured silicone implants. When the studies done in the 1990ies after the silicone scare were reviewed, one finding was that surgeons could identify leaks in only about one-third of patients whose leaks were documented by MRI, which is the gold standard. Often a leak can be identified by a simple mammogram, sometimes combined with an ultrasound when indicated.
So if you really need to know, get an MRI. In my community, these run about $2000, and it is rare that an insurer will cover that.
The issue is, what to do if there is a small leak. With the current generation of gel, the material is thick and viscous, and unlikely to move even if the shell is interrupted. Outside the shell is another barrier, the capsule that your body has formed around the implant. Many surgeons would not recommend surgery to replace a micro-leak implant.
Best practice is to be seen by your surgeon and follow advice that is based on an actual exam and question and answer interaction. All the best.