No, I've never personally heard of it with a good outcome. I've heard of it in the 50s, and typically with a very difficult, poor outcome. One example I personally know of is of a mom in the high 40s who gave birth and sadly passed away within a year after. I'm sure there were other factors in that than just numbers though.
Pregnancy lowers your pfts, thats a given. Most will rise back up, and in a few % of moms-it won't.
If a mom begins pregnancy in the 70s, dips down to the 50s during and after-with the right lifestyle she should typically go back up.
So, if a patient gets pregnant with pfts in the 40s for example, they will inevitable lower-the issue there is how low...At that point you are getting into dangerously low. Serious risk for you, and it must be remembered thats also a serious risk for baby.
What I can say I <b>have</b> heard of is people with pfts in 30s and 40s and bringing up to a much higher baseline. And what better motivation could you have than a goal like this.
Best wishes to you. I began my pregnancy journey here many years ago with low pfts and a not so good lifestyle. I'm proof that things can turn up.