After TKR, does anyone experience some fluid retention on outside of k

I am 7 1/2 months post op, my knee gets tight throughout the day. It feels like fluid builds up on outside of knee.
I am still exercising and stretching my knee eveyday. I do work 10 - 12 hours a day, 5 - 7 days a week. I work on a farm and it's harvest time.