I have a 9month old daughter - my first baby. I was not on any meds prior to pregnancy besides the occasional Xanax to help control my attacks. However, when I got pregnant my anxiety turned into depression and I was dealing not only with daily attacks but also bouts of extreme crying, and I couldn't take my Xanax.
My OB, who was very educated in this type of disorder, prescribed my Zoloft to start, as it is considered the "safest" med during pregnancy. I was worried about taking it and actually waited a few weeks before I tried it. It was horrible, I wasn't eating, could barely sleep, I was so scared I was going to miscarry.
Long story short, I took the Zoloft, 50mgs, and I was feeling so much better within a month after starting them. I did not have another attack throughout my entire pregnancy ... I continued on the Zoloft post partum and I had maybe 1-2 days of the "baby blues" after I came home from the hospital but that quickly faded.
However, within the last week I have been having daily anxiety attacks again, after not having any for 1+ year! Since I'm not pregnant anymore I am back on the Xanax, about to switch to Klonopin until I"m stable and may increase my Zoloft.
Moral of the story - not every woman will get PPD. Especially if you are upfront and honest with your OB about your fears/past history. They will do everything to ensure you have a happy pregnancy, and post pregnancy!