Hi.
Just know that it won't magically disappear one day. The good days are great but they have a way of fooling us. Nice to have one occasionally though...
Your obgyn is a great place to start also. He or she has probably asked and you didn't want to say. Just tell him/her that your depression has worsened and you think it's ppd.

Hormones. Ugh.

Good luck! And congratulations!