@Steelergal
You've gone back to work very early. I know you probably didn't have a lot of choice about that, but it is going to have an impact on your recovery.
Your leg will swell more, as you've already discovered, and that swelling will slow down the progress of your ROM.
It's physically impossible for your knee to bend or straighten more until the swelling goes down, and no amount of exercises can alter that.
Think of your knee as being like a garden hose that's full of water. It's stiff and hard to bend, right? That's what your knee is like. But, let the water out of the hose (and your knee) and it becomes more flexible.
So, when you're not at work, spend as much time as you can resting, icing and elevating your leg, to try and reduce the swelling.
Since you're going to work, that is plenty of exercise for your knee. You don't need to do PT on top of that.
Have a look at this article, especially where it says how much activity going to work entails:
Phased return to work
It's not exercising that gets you your ROM - it's time. Time to recover, time for swelling and pain to settle, and time to heal. Your ROM is there right from the start, and it will gradually increase as your knee heals.
There's no need to rush to get ROM, because it can continue to improve for a year, or even much longer, after a knee replacement. Time is on your side. There isn't any deadline you have to meet:
Myth busting: the "window of opportunity" in TKR