While benching(warm up set),I heard a pop sound and felt pain in the front portion of my left shoulder.

My question is,does it require medical attention and how long should I abstain from exercises that involve the shoulder?

I have full range of motion but with discomfort when I swing my shoulder.

That serious?The pain isn't that bad,just a slight discomfort when swinging my shoulder.
Based on your experience assuming that you have experienced it before,how long should i lay off the weights?