If you are a religious woman try prayer. Prayer Changes thing and people. If it is really ment for the two of you to adopt then you will. In time he {your Dh} will see how you feel and eventually at least lend an ear to learn about your feelings.
Just inform him...... It is amazing what you can do by educating someone even if it is slyly!
you can leave around magazines, books, pamphlets etc....
I am a Waiting mom and well ..........the wait is killing me! (jk)
Take care and keep faithful, if this is really your "calling" then God will see fit to change his heart!