Deprovera

I have been on Deprovera for 14 months now, ever since my child has been born. I have not seen any side effects of this medication, or so I thought. Recently I have been diagonst with Bipolar and depresion and I am on 3 different medications for it. My mother and I have just realized that it could be the Deprovera could be causing the depresion. Does anyone here have the same symtoms or likewise or any suggestions for me? I am in need of some advice... Thanks in advance...