edksd,
I remember that we're only 1 day apart in EDD. I have had swollen feet since 3 weeks ago liao. It's normal in pregnancy. I took a lot of banana, that supposedly contain rich source of potassium to reduce swelling but it doesn't help at all. So I suppose it's natural, it develops from all the extra weight we're carrying. I'm like you too, big thigh, big backside and my aunt told me, with that kind of body build, it's easier to deliver. So don't be afraid. I think 3kg is purely estimation. I wouldn't be afraid if i was you. At most they give you episiotomy when you want to labor naturally lor.. hehehe.