I seen my midwife yesterday and she said swelling in completly normal just watch out for symptoms like seeing stars in ur eyes, headaches, theres a couple more but cant remember what she said. Take it easy and put ur feet up. I do that and within a few hours most of the swelling has gone :)
Totally normal but if it's accompanied by other symptoms it could be preeclampsia and you should mention it to your doctor.
Due to the increase in blood volume in our bodies during pregnancy, yes.