No surety on what it is. Yes, it sounds like a strain. Or it could be something else (like a small avulsion or a tear). No real way to tell, but if you haven't noticed any blood deposition, probably not a tear. I've certainly had strains in which all I felt was a pop.
It's been, what, 10 days since? If a strain, it should have started feeling better already. Rule of thumb is that if the pain is manageable, and it gets better as you train, then you can train. Starr is built on this premise. Your mileage, however, may vary. If pain gets worse, or stays the same, you stop and give a soulless of more days for things to settle down.