Answer: very†. But it often isn’t talked about.
And, I strongly agree, not talking about it is very Bad indeed.
Ironically, I think developed nations’ success in all but eliminating premature deaths from once-ubiquitous infectious diseases has left recent generations without the highly-practised coping skills, social support systems, and painfully resigned stoicism that helped get our great-great-grandparents through the horrible inevitable process of burying half their kids before the poor little bleeders could even make it to adulthood.
We’re all now such strangers to death we’re shit-scared by even the thought of talking about it, never mind directly facing up to it ourselves.
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† Even assuming the hosting part works perfectly, the whole DNA splicing and replication process is always an absolute crapshoot‡.
‡ And, to be fair, if it weren’t for all those accidental copy errors none of us would be here now to argue the issue, for life on Earth would never have advanced beyond the single cell. So yay for an imperfect process, but—bloody hell—is it one harsh SOB.
I often say things like "people should talk about this kind of stuff more because it would help them through it". I obviously mean it in a general sense (very much not trying to get specific people to talk about specific problems). Responses vary from an insincere "yeah..." to the rather odd "you can't tell people what to do".
(Edit: I'm not wanting to say that a miscarriage is a small misfortune. No, it's not. But there are many many worse things which can go wrong.)