K.H.
I did this and it seemed to work for me. My doula told me to take 2 pills twice a day from the very beginning. I didn't wait for any signs of PPD to show up... I just took them, so I couldn't tell you if they prevented me from getting PPD or not. I got the normal baby blues in the first couple of weeks but after that I didn't feel anything more severe than the common frustrations that any mom feels.