No offense, but your in no position to give advice on PE. You came here for information because you don’t have experience or a knowledge base.
The lig “pop” is no more than a sudden, forceful re-orientation of the ligaments, reacting to changing angles from stressing and possibly indicating success at lenghthening.
And frankly, I’m astonished you’re still worried about stretching after what the Doc said.
I’m not worried I feel better.