It worth for doc to take a look at it. But if you want to stretch it then take a pencil in your hand and bend it till one side till the point it gets uncomfortable, NOT PAINFUL, keep it in this position for 20-30 seconds. Then the same to the other side. Keep doing it left, right, up, down and diagonals as much as you can.
This is what my doctor told me to do to recover after a surgery on my wrist. You can do this exercise anywhere(home, public transport, lecture, during a meal) it does not take your attention and helps to get back the flexibility fairly quick if you do not forget to do this