The average woman will be fertile between roughly 15 and 45 years of age. This is the case for the majority of women.
It is intellectually dishonest to try and disentangle female fertility and women!
But most women are not fertile - pure nonsense (see above).
I don’t think “egg provider” is any more problematic than “sperm donor”. It has a reasonable meaning in that context - this is a fair point.
But there is a tendency for activists to try and disentangle 'female fertility' from 'women' that is having an impact on free speech. Look at the recent case of JK Rowling if you want to know what happens when you disagree.