The cause of peyronie's is actually not known. The thought that it's caused by trauma is a theory, not a definite.
If it is from trauma, it's because the tissue heals incorrectly after repeated injury. It's not from one or two minor injuries.
You ask about this often. Have you ever spoken to your doctor about your fears? Only about 6% of men between 40 and 70 have peyronie's. It can happen in younger men, but it's even more rare in younger men. How old are you? You don't have to say exactly, but are you over 40? Close to 40?