Deciding fertility issues

I am 31 years recently diagnoised with BC. Triple negative grade 3. BRACA1 positive as well I just had abnormal pap in April with sever high grade displaca and had it froze off. Went back for follow up in October to come back and thats good but now I have breast cancer. Never been married and no kids but I want at least one child of my own. They say chemo can make me infertile. Doc said I can keep ovaries and cervix but need to have child as soon as oncologist gives ok. Oncologist is pushing chemo back to mid December so I can freeze eggs but.... Genitics said I have a 50%chance of mutation passing on and they can remove those and not use them. Doc said you need at lest 8 eggs for a good chance of pregnancy. Lets say they only get 8 4 of them will have the mutation:-'( my stupid insurance covers this procedure after January but not now. I've applied to fertile hope I just don't know if its worth it any more. Please help😥