I dislocated my right kneecap yesterday...?

Yesterday, while playing basketball, i dislocated my kneecap. My kneecap was on the right side of my knee and it looked pretty bad. But on the way to the hospital my kneecap popped back into place by itself. I went and saw the doctor anyways and after taking x-rays and not seeing anything wrong with my knee, he gave me a brace, crutches, and said that i should be walking in a week and that i'd be completely fine in a month. However, i woke up today and my knee had swollen up greatly (almost covering up my kneecap) and it is much more stiff and sore. Should i be worried at all? Should i be going to physical therapy (i saw online that this type of dislocation requires this)? I'm joining a basketball league that starts in a little over a month so i need to know how long this will take to heal. Thanks!