Hi @Blueskies4, pleased to meet you, but sorry to hear your journey isn't as straightforward as those who'll ever even have to know what PGT testing is!
Let me preface this with the fact that if I had the financial potential to do this, I would have done multiple rounds of EC in the first place or most certainly would have wanted to do more now, but that was it for me, only enough funds for one round.
I went ahead on account of the fact it seemed a good solution to my problem, although I was skeptical about paying so much money to do IVF, when I could get pregnant easily. My consultant's concern was that we wouldn't get any euploids, but that if we did she was not at all worried about transfer as she could see implantation was not my issue...
On account of being able to afford just one round, I was put on high dose stims to try and create as many blasts to test as possible in one go and also did IMSI to try and minimize sperm-based defects. I got 5 blastocysts in one cycle out of 10 fertilised eggs, which I was really happy about as I was quoted a 30-40% blastulisation rate. Out of 5, only one was confirmed euploidy, 3 aneuploidy and 1 tested inconclusive (it was tested a second time and it tested inconclusive again, it's currently on ice, but no idea if it's any good or not).
Whilst I was really hoping for at least 2 normal ones, I was happy to have got just the one, after all my consultant said she wasn't worried about implantation or the transfer.
This is when things started taking a more complicated, costly and frustrating turn...because we only had a shot at one, my consultant convinced me to have all these extra tests to assess endometrial health etc, etc...because you know, since we only had one, we wanted to give it the best possible shot. I had ERA, EMMA, ALICE, Natural Killer Cells Chicago tests (bloods and endometrium) and a hysteroscopy. These tests confirmed there is nothing wrong with my uterus, despite 2 ERPC and 4 MCs in total by that point, I had no infection or bad bacteria. The only 2 finds were, slightly elevated Natural Killer Cells toxicity (for which I was prescribed intralipids upon transfer) and low volume of lactobacillus in my endometrium (for which I was prescribed a course of vaginal probiotics and started taking some oral ones off my own back).
Because of all these extra tests, but also the wait for PGT-A results, the time that lapsed between my 4th miscarriage and my FET finally was 7.5 months - a long time in which I could have almost certainly gotten pregnant naturally again, at least a couple more times, but I strictly abstained from trying as I trusted the process and didn't want to screw things up halfway through (a choice I now fully regret).
Unfortunately my FET resulted in a chemical pregnancy, MC number 5 and precisely what I was trying to avoid by spending all that money and going through all that length. The embryo was low grade 6B-C, but I was told euploid status trumps grade so much that in certain countries they don't even look at grades of tested embryos. I was told that based on my clinic's own statistics, the clinical pregnancy rate for euploid embryos in my grade was 36%, the chemical pregnancy rate was 12% and the BNF rate was 52%, so I literally fell in the lowest odds once again.
I was given a couple of possible explanations for such outcome, one being that PGS may still miss between 3-5% of abnormalities and the other was that I might have had an even stronger auto-immune reaction than the NKC test were able to identify and that for future transfer I should be on a stronger immune protocol than just intralipids.
Sorry I went off on one and this post is very long and probably not very helpful now. The reality is that at my age, egg quality is an issue and likely to cause the only way to get around poor egg quality is to screen the embryos so as much as I'm very disillusioned with the whole thing on account of my personal experience, if I had the cash to do more rounds I absolutely would.
After the IVF fail I went to see a reproductive immunologist - thinking if an euploid embryo still failed me, there must be immune issues at play. I spent 3 months trying to get pregnant on their immune protocol with superovulation and completely failed to conceive, the one thing that used to come naturally to me suddenly wasn't happening anymore. I ditched the immune and superovulation stuff and got pregnant immediately that month, unfortunately that was another chemical, so 6 losses now in total, one of which IVF with PGT-A.
I hope this can be of some help to you and feel free to ask any other questions xx