Hi,
I have a disability in my wrists and get this regularly, now i'm pg it's even worse. Hopefully it will go for you after birth as it is due to the build up of fluid within the small tunnel in the wrist that your tendons and nerves go through. The best thing (and only one) is to try and reduce the fluid in your wrists. You can do this by physio exercises...
Raise your arms straight up towards the celing and open and close your fists, fingers and thumbs stretching out then making a ball... you are effectively using your muscles to pump the fluid with the assistance of gravity. Do this as often as you can throughout the day.
To keep the nerves and tendons moving (instead of getting stuck in the tunnel due to sticky fluid, which can cause more pain) do the same excercise but keep the back of your hand straight and in line with the back of your arm, so this time it is only your fingers and thumb moving not the palm of your hand - don't do this too much if it is painful, maybe only 5 times, 3 times a day.
You can ice the inside of your wrists, then submerge them in warm water or put a heat pack on them (wet heat is always more effective), by doing hot and clod you are again encouraging blood flow and blood vessel dilation which helps to get thigs moving.
I also find it useful if my husband rubs my hands... effectively squeezing each finger/thumb like a toothpaste tube, then my palm, wrist and up my forearm.
Wearing you supports is fine for the pain but remember that they keep the wrist immobile and this does nothing for getting anything moving, over time it also makes the wrists weaker. However it is fine for a short period of time but make sure you do move and don't wear them 24hours a day.
Good luck, if you have any other questions please let me know.
Me