I did, but the situation was a bit unusual.
During my pg issues were found that DS had abnormally large & bright (on scans) kidneys. DH & I were tested and it turned out we were both carriers of a really rare genetic illness (albeit different gene markers). This is very rare anyway, and our consultant spent months trying to browbeat me into a termination inc natural birth - which was impossible given how large his kidneys were. He boasted another couple were in a v.similar situation and he was "going to make them see sense too". A truly horrible man.
Long story short, he was born but died nearly 2hrs later. We decided to remove him from the ventilator (his lungs were underdeveloped and he was struggling). Please, MNers no nasty comments on that, I already live with the guilt & all advice from shitty consultant and the entirety of that FMU inc his boss was that he'd die anyway (put to me in the most callous terms by that boss). They had promised palliative care, which never happened. He died in my arms, by myself - I was alone. Ex had fucked off to his family, as they insisted. Christmas Eve, as well. Champagne corks popping in the ward by families understandably celebrating (we were moved to a side room as soon as one was free).
Moving on. Ex did not want more children. I did. We agreed to try again 2yrs later. It took more than a year, but I did eventually have a successful pg. We now knew there was a 1/4 chance of a child being a 'sufferer' like DS, but that there are people born with the illness which can be managed. I found an amazing UK charity who give support and who have links with a specialist hospital. The hospital agreed I would transfer there if my baby was like DS. Terrified throughout, as cons said no point testing as I would not terminate if illness identified and scans would soon indicate if this baby had the genetic kidney issue. I had a lot of extra scans which were all ok.
I do not, and have never, judged anyone who terminates a pg. I strongly believe it's an individual's choice and should be respected. Although I did find lots of support/resources for those who wish to terminate, there was very little for those who want to continue the pg.
I did need some steroid injections before the ELCS to help baby's lung function (this is fairly routine now for ELCS births).
My youngest does have some health issues causing her to be bordering underweight all her life so far. Despite this they are fairly healthy and very happy.
I wish you all the very best. It is heart rending to have yet another miscarriage or another period when you'd hoped so much it would happen this time.