swollen feet

Ok, so I have not had any swollen feet the whole pregnancy, and I am now 37 weeks and omg my feet are ridiculously swollen for now almost a week. Why is that? I lift them up, I try to eat less salty stuff, I have put them in a warm bath with Epsom sal, I sleep on the sides and even in the morning I still see them swollen but not as bad as the night before?  By the time I get to work and sit at my desk that's it they're bigger already.

Oh and my blood pressure is really good too.

Why such a sudden change?