It could just be absolutely normal, but swelling can also be a sign of pre-eclampsia - in which case it is usually accompanied by raised bp and protein in the urine. I had borderline p/e while I was pg and it was the swelling that wasn't going down overnight which made me get it checked out. I'd had low bp all along but then it suddenly shot up between appointments. A friend of mine had lots of swelling but was fine otherwise though.

I'd get it checked out if I were you, just to be sure.

I used accupunture and massage (feet 3 times a day by the end!) to relieve it.

ETA: sorry, I was distracted by small whinging child! I means to say good luck too