You asked, "If so, does it go away when PT is finally over?" Any pain that gets worse after PT should be addressed with the therapist. There may be some adjustments that can be made to your exercises to help you - just like shoes and pants, PT should not be "one size fits all."
A couple of other considerations - the TKR will have changed your movement as you learn to walk with the implant, and with less pain. Ask the therapist to evaluate your gait and see if you need "gait training". Others here have mentioned needing orthotics because the position of their leg & foot has changed. Check out this ongoing discussion to connect with others: https://connect.mayoclinic.org/discussion/posterior-pain-9-weeks-after-total-knee-replacement-surgery/

Ten weeks out is early days - hang in there and it will get better. You are well on your way by keeping up the therapy!
Sue