Hi,
I am no authority but no one else has responded so I will put in my two cents. From my experience, ice and elevate, and anti-inflamatories, are for sure where to start. It's good that there isn't any overt swelling though there is obviously something under the surface. If you are lucky, and why not be lucky, you'll feel improvement in a couple of days. If no change at all after the weekend, start with your family doc and go from there. Knee are basically badly designed. They can be injured terribly easily but just as easily, can heal on their own. Here's hoping that this is the self-healing type.
Good luck.
KatieO