C.O.
Try to walk a little bit to get the "pumping" action going. walking helps get the fluids moving. Continue drinking your water. I would check your salt intake. It might be too much; or, suprising as it sounds, not enough.
Lack of sleep can also affect your fluid balance. Try to take a nap if you can.
If your blood pressure starts to creep up, or you start getting headaches, or the swelling becomes more severe, or you start seeing floaters or flashes in your vision...then call the doc.
Take care and congrats on the baby.