Quoting NevviesMom:" I'm pretty sure I had PPD after my daughter was born 6 years ago. I was absolutely miserable after her ... [snip!] ... about the possibility of the downward spiral again.. Since I believe I had it before, am I susceptible to develop it again?"
It's possible, but it may help that you have support behind you now. Talk to people close to you and make sure you have plenty of help. Let them help whenever they offer. Talk with them about PPD, let them know you're worried that it may happen again so they can also help you look for signs before it gets bad. I dealt with extreme PPD after my daughter was born last January, I wish I would have talked to someone before it got to that point. I waited until I literally was so full of hate and resentment. I'm preparing myself for when I have this baby to make sure it doesn't happen again. You know you're body best, if you start to feel different talk to your doctor ASAP.