I'm just finishing a day where I taught all but 1 period. My knees hurt. Almost feel like I hyperextended them, but as I only walked on Wednesday and did nothing yesterday, that seems impossible. Possible causes: Being on my feet all day in shoes with little arch support that I don't normally wear; or the pregnancy thing. Being RA related seems unlikely, there's no swelling or heat.
I'm at least going to the gym to do some upper body weights today. Hopefully it's the shoes. If not, I guess I just learn to run (or run/walk) with this like I am learning to run with a belly. And hopefully it doesn't progress.