Everyone I spoke to before op said exercises are hard and very painful but have to be done. Doc says it s impossible to overdo the exercise
I do not believe that your OS ever had a TKR. Listen to your body---it is telling you to cut back. It is not "no pain, no gain" with a TKR recovery---rather, it is "No pain, more gain."
Please consider the surgical trauma that your knee has been through. You need to take it easy.
Recovery from a TKR can be a long process, and you cannot reach the destination of being totally recovered in a few weeks. Take your time.
You will dance at the wedding; you just have to be patient with your recovery; the harder you work with this, the more behind you may get.
Gentle exercises; rest, ice, then elevate as often as necessary; not just twice a day or so.
Your knee will thank you for it, and you will be less frustrated, less painful, and you will see more progress.
It is also important to note that progress may be slow and normally is not linear---you will have good days and some not-so-good days---but you will indeed dance at the wedding!