Twinkle, not a horrible birth as such ... but not that long ago I realised that I never went into TTC with an optimistic mindset, I always thought it would be difficult. It was, took 18 months (small beer by some standards, I know). Then an unremarkable but still miserable tired and nauseous first trimester, second trimester characterised by the longest attack of thrush ever, third trimester of heartburn and huge unhappy fatness. Birth ... "I have no happier expectation of giving birth than I do of being murdered" (misquote, probably, either Rachel Cusk or Kate Figes). PND and grumpy baby ... I suddenly realised that a second child wouldn't constitute another bad year (DD's first year, bless her, was grim), it would be a bad three years. Or it might not, it might be a breeze, but I'm not convinced.
Plus, the only time I got near to thinking a second child might be a good idea after all, I remembered that TTC would involve lots of sex, and that made me feel terribly tired and put me off the whole idea once and for all.