Embryo Grading & PGT Testing

Hi. So I’m on Retrieval #2 and I just found out I have a 6AA, 2x 7AB and a 6BC. What are the chances any of these are normal embryos? I had a 6AA & 6AB last time and both were abnormal. The second results look less promising? What’s up with the Day 7 embryos ? Pls help me navigate before my next follow up.