Polar Bear, what a wonderful hubby your wife has going through this process! If only all our hubbies could have your level of sensitivity.
I have seen many successful stories after beta starts similar to yours.
On another note, have you guys had thorough investigations as to why 4 donor egg cycles haven't worked? There are some great threads on this forum and some very experienced and wise ladies who might be able to suggest further testing or additions to protocols should this not end happily.
Best wishes to you both and looking forward to hearing your update.