Just to give a different perspective - I am starting to feel more confident, and I'm only 12 weeks. Don't get me wrong, I have lots of moments of massive panics, and I can't imagine telling other people yet, but I'm finding each day a bit easier, and compared to six weeks ago - when I was a total mess - I'm so much calmer. I don't really imagine having a baby - but, again, I'm still so early - but I don't feel as fixated with thoughts of losing this pregnancy.
Weirdly, in this regard, I think the fact mine were repeated and followed such a pattern helped (I am also very lucky that they were all so early). Since development stopped at the same point each time, including the MMC, it felt like something specific was going wrong right then - and, whatever happens with this one, that thing didn't happen. So I find it easier to tell myself - I don't always believe it, but I find it easier to at least think - that my odds are like everyone else's now; that things might go wrong - of course - but that they probably won't.
Even typing that gave me lots of 'stop it, you're jinxing yourself!' type feelings, though! I can't imagine buying anything, or making concrete plans - I'm going to tell work if my scan on Friday goes well, and I think that'll set off a lot of anxiety in me. Generally, though, I do feel a tiny, incremental bit better every day.