I had both my knees done seven months ago and I wouldn’t think that much swelling at this time would be considered normal. I’ve been told it takes a complete year to heal from a knee replacement. My swelling diminished fairly quickly after six weeks and now what I find is I experience stiffness when I don’t move or if I lay down too long. My legs feel much better if I make sure I walk at least 5km+ a day.
I regularly elevated and iced my both knees, three times a day for the first three months so I found that helped. I would definitely be investigating the cause of so much swelling at this stage of the game. But I wouldn’t be surprised if they told you you have to wait at least a year before they can determine if anything is a concern.