Speaking from experience also… this started to become a problem for me around the fifth pregnancy, and by the last one (#8) I had swollen ankles at about twelve weeks (ugh!). I also consume little salt, drink lots of water, etc. I had to resort to support hose, which were a lifesaver for me. I bought from Ames-Walker online. With those, I could function just like normal.
For me, also, a brisk walk around the yard was also helpful – if you have any trouble with varicose veins, make sure you alternate your sitting with some walking, if possible.
Blessings to you, you’ll be meeting your little one face to face before long….