Poor Quality Embryos

Hello Everyone!

We are currently in the FET process after 4 IVF cycles we were only able to make 3 poor quality embryos those are 4cc, early blast , forming blast these survived PGS test and came back normal. My RE transferring all 3 due to poor quality. Currently started with estrace and I’m worrying all the time. This will be our 3rd transfer. Has anyone did PGS on poor quality embryos , transferred and got BFP ? Healthy pregnancy? Any inputs are appreciated.

Thanks !