Not every human female who wants to should be allowed to bear children...

It should be an explicit part of every national government's governance to determine how children may lawfully be born, to whom, and how they are to be nurtured, cared for and educated, once they have been brought into existence.  Children deserve no less.

So, yes, bullshit aside, the first thing that must be determined is the prospective female breeder's physical and (so far as it can be evaluated) mental fitness to bear children.  And yes, those judged unfit should be sterilized. 

Secondly, the physical and mental fitness of the proposed sperm donor must be objectively evaluated; if judged unfit, and heterosexual (i.e., likely to reproduce if allowed to do so), potential sperm donors ought also to be sterilized.

Thirdly (the first two pre-conditions having been satisfactorily met), with or without the participation of the child's parents (though, of course, hopefully, with), the birth, nurture, care and education of the child will  be supervised, regulated and provided for by the state.

Every pregnancy being thus provided for, protected, and in fact made possible by the state, abortions will be permitted only in cases of medical necessity--never at the mere whim of a prospective mother who's changed her mind.  After all, in my experience, life does begin at conception.