Mrs. Bennet, Pride and Prejudice
It becomes abundantly clear after the birth of Mary that things are not going to get better; Mr and Mrs Bennet at last have an overdue conversation about the state of their finances and reluctantly agree that trying again and hoping for a boy is a terrible plan of action. With only one overtly ridiculous relative (Mary's much less dour when she's not trying to distinguish herself from four beautiful sisters), Jane has no problem marrying Mr Bingley the first time he proposes. Mr. Wickham barely comes near the Bennets, who consider him a pleasant, if vague, acquaintance. There is no scandal attached to the family. Mrs. Bennet does not worry herself into an early grave trying to marry off five daughters, and actually finds herself enjoying her old age.
Lane Kim, Gilmore Girls
Lane Kim deserves to have a lot of good baby-free sex before she decides she's ready to be a mother. One awkward encounter on the beach isn't going to cut it. She takes some time to think it over, mostly as a nod to appearances (she wants to at least pay lip service to her pro-life, conservative Christian heritage), then calls Lorelai and asks her for a ride to the clinic. They go out for burgers afterward, and Lorelai keeps up a high level of patter every minute they're in the waiting room, which for once Lane appreciates.
Read more Fictional Characters Whose Lives Would Have Been Vastly Improved By An Abortion at The Toast.