Hi
@Ref1 ...
Like you will hear from others, it's really hard, sometimes, to determine what was the thing you did that made your new baby knee say, "Too much!" I've had this happen many, many times, so I hear you! Some of us refer to it as joining the "OverDid It" Club...even when we can't figure out the "what"! So, yes, more pain, even when you can't directly trace it, IS normal!
As Jamie said, increased pain usually means over-activity, even if you can't figure out what was the "too much" thing... And, in my case, having had both knees done now, they were not the same! My first one took me far longer to recover from than the more recent one (surgery in late April). With #1, the pain medication did NOT work, so I lost valuable time early on and it took about 9 months to get my bend to a really useful level. It took me a good year to be able to really forget I had a new knee, and I still had some aching after more than normal activity for maybe 1.5 years. With this new knee, I'm far beyond where I was at 9 months at only 5 months...so even two knees on the same body can differ by a lot!
If you can find a little notebook to jot down your activities each day, maybe you'll begin to see a pattern? Just even write down things like "cleaned up shop" - 1 hour, "reorganized garage and boxed giveaways" - 2 hours, "did dishes" - 25 min, "rode bike - 45 min.," etc. Anything that requires you to be on your feet and not resting it. Yep, ANYthing!
I found... and still do find... that I overlook excess activity, thinking I can just cruise through daily life like nothing has been done to my knee. I have a dog, so taking him for a longer walk counts as extra, doing a second walk because it's really nice out and is supposed to rain tomorrow, like we did today: extra! They all add up to things your knee needs to do that it may be annoyed with later. So, tonight, I'll be sure to put the herbal/CBD salve on that helps it, for instance. If I was really concerned about being achey, I'd put an ice pack on as I got to bed, and as long as it stays cold will help.
At the end of each day, I think back, or look back at my scribbles, to see what all I did. Then, I can more carefully consider my new baby knee's needs and plan accordingly.
Trying to keep notes like I did might help you re-think your days to better allow for preparation for more pain later... I hope maybe this will help!? It IS normal, though!