I Am 3.5 Weeks Post Knee Replacement. I Didn't Expect

I am 3.5 weeks post knee replacement. I didn't expect it to be this difficult and am not sure re the pain. I was given a 7 day supply of percocets and am now just icing and Tylenol extra strength. I am still in an awful lot of pain and not sure if this is normal? The swelling is mostly gone except above my knee and bit on the outside. I am just not sure what to do at this point....