@mary64 - I've moved the above two posts from someone else's thread into your own recovery thread. Please bookmark your thread, so that you don't post about your knee in another person's thread.
Thank you.
This new pain may because you've overdone the exercises. At this very early stage of recovery, you really don't need many exercises.
Just walking around your house is enough exercise for now.
Your knee has been through a major surgery and it needs time and gentle treatment, so it can start to heal.
So, spend less time doing exercises and more time resting, icing and elevating your knee.