Preimplantation Genetic Screening (PGS) also known as Preimplantation Genetic Testing - Aneuploidies (PGT-A) refer exactly to the same thing, to the same technology. PGS is an embryo selection tool that can be used in infertility treatment. PGT-A is the newer nomenclature but both PGS and PGT-A are used interchangeably and refer to the exact same thing.
Miscarriages can be devestating. Most occur because the developing baby has a genetic abnormality. If you experience multiple miscarriages, it is important to see a fertility specialist to check for any underlying causes.