Hi @Lucille89 sorry to hear you've had a rough time of it.
When you say 6 unsuccessful rounds of IVF, I'm assuming you mean 6 embryo transfers rather than 6 fresh cycles (i.e. a complete process of stimulation hormones, egg collection, development to blastocyst etc)? I think that's what you mean as you said all blasts were from one cycle. If so, then it's not unusual for someone of any age to need more than one cycle of IVF before they are successful. I'm sure 6 failed transfers has felt awful but know that you're (sadly) not alone and yours is by no means a hopeless case.
Has your clinic suggested any tests (beyond PGS) to check other factors - e.g. a thrombophilia screen? It could be that your transferred embryos were all aneuploid but after 6 transfers I think checking for other issues would be warranted. Do you have a partner, or are you using a sperm donor? If you're using a partner's sperm, have they been checked out?
Your AMH is good, so you seem to have the ovarian reserve to try again with your own eggs if you want to. PGS could definitely help identify any euploid embryos before transfer, and if you got a similar number of blasts to the 6 from your first round then it could save you the time and money of transferring one by one. At 40 you still have options, so it's obviously an intensely personal decision but I don't think you have to stop trying yet if you don't want to.
I also only have one ovary, my AMH hasn't been tested since last year but it was 9 then. I'm single which is why I have to go the IVF route. My first round of treatment (age 41) resulted in one 5AA blast, fresh transfer, BFN. My second (also 41) I got 5 blasts and all transfers were frozen because I was at risk for OHSS. My transfers were 5AA (BFN), 4AA (chemical), 4AB (BFN). One blast didn't survive the thaw and I still have a 3BA in the freezer. I'm now 42 and currently on stims for my third round, hoping for EC next week. My original plan was to bank blasts from this round, then do a second collection and PGS everything (including my 3BA in the freezer). I'm now leaning towards a fresh transfer, though I know my chances are not great. At some point in the next 6-8 months I'll have to stop, both because of money and because I'll hit 43, but I want to feel I've given it all I can before then.
As @Loveintherain said, the Over 40 thread is good if you've not already found it. Lots of luck.