IVF with PGS will probably not improve your chances of getting pregnant, because if you are destined to become pregnant successfully again, you will whether or not you do
IVF or
IVF with PGS. If, on the other hand,
IVF with PGS shows that all, or almost all, of your embryos are abnormal genetically, then you will have an answer about why you have had the 4 miscarriages. IVF with PGS will likely cost in the $20,000 range in a non-mandated state.