I Fell A Week Ago And Impacted Both Of My

I fell a week ago and impacted both of my knees on concrete. There was slight discomfort the next morning, but no swelling, and very little, not very noticeable bruising. Both knee caps are sensitive to the touch.....an odd sensation and it will linger if I poke around at them and irritate them, but no significant pain and still no swelling. I have been walking a couple of days with no significant discomfort......the odd sensation will sometimes present upon impact going downhill. I'm no stranger to knee problems, but this is unlike other times when I know I have damaged something. I'm terrified I have damaged my knees. Please advise. Thanks!