Hello, and sorry to hear about your fall. First of all I want to make sure you didn't fall on anything else, especially your head, if you did, you should go it to be evaluated. If it truly was just your knee, you most likely didn't hurt anything mechanically. I would suspect you did cause some tissue damage, which will lead to some swelling and extra fluid on the knee for a few days. I would continue to ice it for the next few days, and it should begin to recede. If it doesn't, and it continues to swell, or your range of motion decreases, or you develop fevers or any other different symptoms, it would be worth getting checked out.
Otherwise I suspect you'll be just fine.
I hope this answers your questions, if not, please let me know, best wishes...
Please ask if you need clarification/more information.
POSITIVE feedback & a BONUS are greatly appreciated.
Please note that answers are for information only, do not take the place of an assessment by your doctor, and does not establish a patient-physician relationship