Swelling

I'm 19 weeks and 2 days, for the past 4 afternoon/nights I've noticed I've began to swell more in my feet and legs. When i wake up in the morning its in my hands and face as well, it's not too dramatic but enough to be bothersome. I have been extra active with the holidays and working extra hours so I try to rest when I can, drink lots of water, and stay away from sodium when possible. Does anyone know why this has all the sudden appeared or any tips extra tips that could help?