Perhaps the universe thought they were morons and decided to avoid...
Only joking obviously (if only that was how the world works...).
Done a lot of IVF here. Here's my understanding of PGTa, which we did (a lot 🙄). PGTa testing tests for the right number of chromosomes. When an embryo has the right number they're called euploid, when they dont theyre called aneuploid. The VAST majority of aneuploid embryos are 'de novo' - as in, created when the embryo was created, random, new. Not inherited from either parent, just a brand mess up in the genetic building blocks of the embryo.
So it WOULD catch a random extra chromosome (like in Down's Syndrome), or a missing one. You would also have become aware of these in your 12 and/or 20 week scans.
PGTa testing is great because a lot of those aneuploid embryos would never get anywhere with growing once implanted, so they'd either not implant, or implant but then fail early, or fail later on and poor parents are then distressed by a miscarriage. It would identify Trisomy 16 and 22, both of which are almost always fatal to the embryo and considered a huge cause of miscarriage. In the IVF world, this is also a very expensive waste of time as you're paying to transfer embryos that may not/are likely not to be genetically viable and aside from the emotion, your cost and time to successful pregnancy is then longer.
My clinic recommend PGTa testing if you have loads of embryos because it cuts down your time and cost in 'sifting through' naturally by transferring them and seeing what happens. If you only make one or two they deem it not worthwhile as the cost of the testing vs just transferring and seeing is negligible (ignoring the emotions for parents obv).
PGTa would flag inherited conditions, but ONLY if it meant that the number of chromosomes was abnormal - it is essentially just a counting tool. So lots and lots of conditions e.g. cystic fibrosis will look normal to PGTa because they're still the correct number of chromosomes. If you or the genetic father had (even without knowing it) Klinefelter Syndrome, Turner Syndrome or Jacobs Syndrome (all caused by either missing or extra sex chromosomes inherited from parents) then this would have been screened out.
As you have gone on to have successful euploid embryos, you can rest easy that your baby does not have any of the aneuploid conditions.
There is, of course as there is for any of us, a chance that your baby could have another condition. However, by far the most common of these are structural (heart defects, spina bifida, cleft palate) or achondroplasia which is a frequent cause of dwarfism, and you would know about these by now as you've got all the way to the end after scans where these things are specifically checked for!
When baby is then here, they'll offer to test them for a raft of conditions (cystic fibrosis, sickle cell and so on), some of which are inherited, but PGTa would have missed. The great thing about the heel prick test is that they are all conditions where early diagnosis leads to targeted treatment so they can be managed beautifully and often have only a very small impact on their lives going forward with the correct treatment.
If you've got a pgta tested embryo that becomes a baby with a clear heel prick test, your risk of anything genetic is then around 0.5%.
Now - importantly!!! Your 'friends' are c...ts and also just a bit thick. BUT - ivf is a uniquely horrific process that fucks with your brain (ask me how I know....!). IF this is just late pregnancy worry that has been reassured by this thread and goes away when baby is here then brilliant. But IF baby is here and you still find yourself thinking, but what if this, what if that, and the thoughts don't stop and you are plagued by them, please please please seek support from your GP and perinatal team that they can refer you to. OCD and other anxiety disorders, often characterised by an inability to stop worrying about baby no matter how much rationality youve tried or research youve done is VERY COMMON for anyone postnatally but especially women who have been through the absolute head fuck that is IVF. So if your brain still holds on to this stuff when your baby is in your arms, people will help xxx
Best of luck. My IVF babies are the best thing that ever happened to me. You're in for the greatest adventure ever ❤️❤️❤️