It's normal. I've been getting swelling in one foot/ankle on and off for a while now. My OB says it is very normal to just get swelling in your feet and ankles without it being anywhere else. Mine is a little more unusual because it's just one foot, but again he said it can be normal or it can be due to a clot. Any pain in the calves associated with swelling of feet/ankles needs to be investigated.

I was told to lie down at the end of the day and raise my feet above my head and massage the fluid downwards towards my knee. I find that the fluid usually goes down over night but returns the next day. I do have days when I have no fluid at all.