I Had Total Knee Replacement Surgery 5 Weeks Ago. I

I had Total Knee Replacement surgery 5 weeks ago. I know it is going to take a while to be fully mobile. I am doing my physio mexercises 3 times each day. Yesterday I was getting into a friends car and he said bend your knees while getting into the car. I did this and the pain in my operated leg on the right side of my knee was excrutiating. I came home and applied ice packs three times during the afternoon. I still attempted my exercises but felt I had to take it easy. Have I done any form of damage?