Hi Sphere27, when I was first went on HRT (elleste duet 1mg) a year ago, I had quite bad fluid retention, my ankles especially were swollen, and a knee injury I had sustained earlier in the year flared up and became swollen again and some RSI I have in my wrists also flared up. After about a month to six weeks these all subsided and it doesn't appear to be a problem now apart from the odd flare up of RSI which might be related to something else anyway.
So I think (and hope) if you stick with it, it will subside too. Good luck.