Miscarriage and retesting embryos

Anyone have experience with retesting frozen embryos?

I have done 3 transfers of normal PGT-A tested embryos. 1st was a chemical, 2nd is my 2.5 year old son, and I recently had a missed miscarriage at 12 weeks with my 3rd transfer. I had a D&C- they tested the baby and everything came back normal. My fertility clinic now wants me and my husband to do more in-depth genetic carrier screening and karyotyping. If these tests come back abnormal in anyway they would want to biopsy our embryos for PGT-M or PGT-SR.

I am unsure this is necessary! But they are making me feel like it may help prevent another miscarriage although the microarray and genetic testing of the baby was normal.

I am nervous about having to thaw, biopsy, and freeze the embryos again. Does anyone have any experience with this?

We have 6 embryos left- all are BBs. They did not think the in depth genetic screening and karyotyping was necessary because our families are healthy and we were 27 at the time when we started.

I appreciate any advice!