I had this too, with my last 3 pregnancies actually.

I was told as long as there is no pain, hot spots or red areas on the leg, everything should be fine. My left foot actually swells even more dramatically after having the baby so I just try to keep the foot elevated as much as possible and get Dh to massage it too.

I think it is definitely best to get to checked out, but don't stress too much as it is fairly common. I hope your swelling goes down soon