Here I come with my anecdotes :o
I was 24 and had been married for three weeks or so when I found out I was pregnant with DS. I was terrified; it wasn't in our plans yet at all. I remember walking to the store to get the test, whispering "please no, please no" under my breath. (Sorry, DS!)
The first two trimesters were fine. Last, I was slammed with a depression so dark and deep I don't really have words. It was like a monster, bent on destroying me. It was like I'd never see sunshine again. I didn't want to take anything for it and suffered until he was about two months old. I was very protective of him and knew objectively that I loved him, but mostly I was just afraid.
I went on AD's for only two months (should have been longer) and they helped some. I started to feel really bonded to him when he was about four months old.
Slowly things got better. A day would go by without feeling bad, then another. Suddenly I realized I was feeling good most of the time.
Because of the depression, it took me a long time to convince DH to have another. DD was born a little over 16 months ago, right before DS turned 6.
I was never depressed with her. I think a big part of my issues with DS centered around becoming a mother in the first place...terror at my life changing so unexpectedly, knowing that I would never be as carefree as I had always been.
So compared to that, I found the jump from 1-2 much easier than 0-1. I feel much more confident this time, like I've found my feet. With DS, I was so worried about what I "should" do, with DD I find myself completely able to trust my instincts. The age gap is wonderful...DS adores her and is so protective. It's so sweet to watch them play. Just tonight they were taking turns on pushing each other on a riding toy and giggling like mad.
That being said...I'm now facing another surprise pregnancy. DC#3 will be here in May. I'm in shock and I don't really know what to feel. I'm excited for the baby but the thought of pregnancy and labor fills me with dread. I said I wanted more eventually bit even so, I'm shocked. But I know I can get through it and it will be fine.
I guess, in a round about way, I just mean that no matter what your situation...married, single, young, older, want more, don't want more, an unplanned pregnancy will knock you for six. It's hard to get your head around.
I think you're doing a good job keeping your head and taking everything on board. Best of luck with your decision. 