Depressed...

My husband and I have a beautiful 3 year old girl. We began trying to get pregnant in May and we were pregnant by July. I was so excited...now I am six weeks and depressed. I suffer from depression anyway and as soon as I found out I was pregnant, I stopped my medication. What can I do to naturally hell with my depression? I was hoping this time around would be different since I was trying...but so far it isn't. I don't want to be sad, I am so blessed to be able to bring another child into this world, but my depression is always trying to take my happiness away. Please help.