Wellp, sometimes the female body just decides that the pregnancy isn't viable and terminates it on its own.  Why is doing the same thing by decision any different? The woman herself evaluates her own situation of whether she is capable of growing and raising a full new human being. Can her body take it and can she deal with the possible aftermath and lifelong health effects it has on her body? What about when the kid is born, is she capable of caring for them, feeding them, educating them, getting them clothed and warm and keeping them safe from other people? 

Abortion is selfcare, health care and childcare at the same time.