I would definitely prioritise other investigations if cytogenetic analysis shows you've miscarried normal embryos
As PGS isn't going to solve the problem, if you haven't addressed the underlying issue
Have you had full level 1 and 2 immunes?
uNK biopsy @ Coventry with Prof Quenby / Brosens?
If you've had ERPCs then have you had the uterine cavity checked for scarring and adhesions?
I would strongly advocate for checking these out first and seeing if you can identify the issue
I would also advocate for PGS as well, but as a diagnostic measure
I miscarried what testing of the POC showed was a normal embryo, we know the issue was almost certainly my endometrium. If we hadn't done PGS, we wouldn't know if the next transfer failed / miscarried because we'd fixed the uterine environment but the embryo was a dud, or the embryo was normal but we still hadn't cracked the uterine environment
We did PGS, transferred a normal, and I miscarried again. So we know we still haven't fixed my uterus
It's a very expensive diagnostic exercise however, and if you've got normals before, it's clear chromosomal issues and making euploid embryos aren't your issue