On the off chance it's something else and continues and you need to get it checked out, I recommend this clinic -
the Calgary AKIC. I saw them in November after I fell down the stairs and sprained my MCL. My worry was that I damaged the ACL repair I had done years earlier, but I realized pretty quickly the ACL was still intact, and I'd done something to either the MCL or the meniscus. I filled out the form online on the Saturday and had a phone call by Monday and an appointment by Friday. They were great.