Hi, I Injured My Knee Or Something About A Week

Hi, I injured my knee or something about a week or two ago but not sure what's wrong. My knee gets very swollen on the inside of the knee but doesn't really hurt to bend it or walk or anything. Sometimes when I walk or do something my inner knee or Bastia medialis acts up and feels like the muscle or tendon rolled up in a ball. Idk how to explain what I'm feeling because I've never had this problem. When the muscle acts up or something I can usually just rub the area and that ball sensation goes away. I'm not sure what's going on or what to do because I have college soccer in a week?