I mostly agree with you on the morality of abortion. The only problem I have with your analysis is with the temporary nature of pregnancy. There are risks in pregnancy that can have permanent consequences. Even if the birth goes off without a hitch, the mother is often left with weight gain, stretch-marks, and a risk of post-partum depression. Incisions are often needed to widen the birth canal and sometimes a C-section is required which is major emergency abdominal surgery. These risks are entirely taken on by the mother.

If we look at morality as having things people should do, and things people must do, only the musts should be law because the shoulds can be more open to interpretation. I wouldn't assign my morality onto others. I would classify going through with a pregnancy as a should.