to you, 'unlucky' probably doesn't even begin to describe your feelings.
However I just want to point out that there is potential for plenty of 'unlucky' in adoption as well.
Up until you have been approved etc. it is different to that immediate, intense thing that comes with pregnancy loss. It's more abstract and I found it easier to keep at bay, things didn't affect me that much.
But once a specific child is identified, it all changes. You need to start committing to this child, mentally, emotionally. (Chances are that if you keep some emotional distance, some patronising SW will say you are not committed enough and thus not approve the match). However there is initially NOTHING that links you to that child except some words that could very well turn out to be meaningless.
The child, who is 'your child' in your mind and heart, is in somebody else's care, you have no right to see them, even to pass something on to them, chances are you are not told very much about them. You will be hoping for information, clarification, a moving-in date - but these things may be delayed and delayed again. You may not get to meet 'your child' for months and months. It can be quite torturous - because this is 'your child' we're speaking of. In your mind. And then finally that elusive placement order comes through, or that matching panel is scheduled, and all of a sudden you are given new info that makes you seriously reconsider. Or the child's SW suddenly no longer approves of you. Or suddenly a distant relative of the child turns up and the child will not be adopted after all. Or for some ludicrous reason the agency wants you re-assessed at the last moment and the child goes to other adopters while you wait for your new panel dates.
Of course these things don't happen to every adopter - some have plain sailing. But they are in fact frighteningly common. It is this kind of 'unlucky' that you could come up against, and just like when your body is not working right and causing you to lose that pregnancy, there is nothing you can do about it, except try again.
So I would humbly say, that if you are concerned that you can't deal with much 'unlucky' anymore, then adoption probably needs to wait a bit. Give yourself time to grieve, to recover, and then think carefully about which kinds of 'unlucky' you now have the strength to deal with, should they happen.
Wishing you lots of 'luck' whichever way you choose to go!