Dear pmeet,
This is a very difficult topic. If successful cbt or bmt can be a miracle, but not without risks and sometimes loss of life.
The IVF process is difficult on the mother and can be very stressful, if you achieve a successful pregnancy with a healthy matched baby that can be a wonderful miracle. I won't advise you against the procedure, I only want you to be prepared.
Having matched cord blood stored is a good thing. If in the meantime gene therapy proves to be successful and safe then you may choose that route instead but it may be helpful for you to have cord blood stored as a back up.
Best wishes in whatever you decide,
Sharmin