I'm glad that the thread is still here, and that my previous post was deleted. The other post was my knee-jerk reaction to trois and I should have calmed myself down a bit before posting. Sorry for being offensive.
I wanted to come back and actually respond to the OP!
I'm not overly sure what caused my PND. My pregnancy was a bit of a surprise to begin with because I had been told I would be unable to conceive without help. We were trying but never expected to be successful and fully anticipated a trip back to the GP a year or so down the line for some drugs. I was made redundant about 2 weeks after my BFP and then had the stress of having to find another job before my pregnancy began to show.
I started a new job and then had the stress of having to hide my constant nausea etc until I had been there a couple of months and had to tell them. Needless to say (and understandably!) my new employers weren't happy and I wasn't treated very well by my line manager.
DD1 was born at 37 weeks, which was a shock because everyone else I knoew who had had a baby was at least a week overdue! My labour was quick and very painful...there was no gradual build up of pain as it was very full on very quickly, and I didn't cope with it well.
My PND was pretty much immediate I think. DD1 was placed on my chest/stomach by the mw and I felt absolutely nothing for her...she could have been anybody's; could have been a puppy or an alien from outer space. Then my post natal care was shocking and I had no help with breast feeding until she was past 24 hours old.
My primary feeling throughout her first few weeks was pure unadulterated panic. I cannot being to describe the sheer dread I felt...dread of going to bed and facing the night ahead, dread of DH going out to work, dread of being stuck like this for years and years. I counted down the days until she would start school because I thought that that would be when it started to get easier.
The I took her for first round of immunisations and the lovely nurse at my GP practice just knew without me having to say anything and referred me to the HV. I started my long and painful journey to recovery.
And now this is the longest post ever but I just need to add that if anyone is reading this and suffering in silence, please talk to someone. As someone who was suicidally depressed I promise you that you will get better.