Sudden swelling in late pregnancy?

Anybody else happen to wakeup with one swollen foot, ive had swollen feet my whole pregnancy but nothing like this, it looks like a reaction from something. The top of my foot is squishy, I hate how it looks. When I called dr., she sounded as if its natural to have swollen feet and it will go away if elevated or drinking water but Its been the same all day n nite, ive tried drinking water and keeping feet up :/ Im 39 weeks pregnant now. My left foot isnt swollen at all 😨