Swollen foot

Chelsea • I miscarried back in May of 2015 with my first baby, a beautiful little girl. I am now pregnant with my 2nd baby, and due on October 25, which is exactly a year from my due date with my first one.
My entire pregnancy (I'm 24w+3), I have had absolutely no swelling in my feet at all. Last night, out of the clear blue, my right foot got swollen, and it is still swollen. My left foot is totally normal though. Is this common or should I be worried about it?