So you're a week in at 20mg/day, right? Be as specific as you can (e.g. 10 days, 7 days, etc.).
That early in and with a shoulder injury, I'd jump off and right onto a natural test booster. That is low enough and short enough that you shouldn't need to do a full PCT. You can keep taking your support supps for another week or so just to be safe, but that's what I'd do. If it were anything less significant, I'd think about staying on cycle, but that is an injury that will affect everything pretty drastically, so I'd just can it. If you don't have a test booster on hand, I'd nab some HCGenerate or Phytoserms since NTBM ships it out super fast.
Either way, that sucks, bro, and I hope it turns out not to be anything too significant. Please keep us updated.