you ignore why they have an unwanted pregnancy. If they don't want to get pregnant, they can use birth control, or insist on him using a condom.
If neither of the above are applicable for some strange reason, they could always insist on oral only or shock horror, don't have unprotected intercourse during their fertile period.
Seems that some women don't want to be responsible when having sex, and prefer to just kill an unwanted foetus.