Please don't worry about hurting your implant when you overdo things. It is strong; it's the soft tissue around your knee that's impacted. Recovery is never linear. There are always ups and downs. When you overdo things, step back and make an extra effort to rest, ice, elevate and take whatever pain meds are needed. This is part of the reason why we advise people not to try and get back to a normal routine and work too soon. It's easy for people to assume you're all healed when you show up at work. And then when you have a setback, they don't understand why. If you can take a day or two off and work from home, that will help you.