I think the direction that science is going is that the distinction between person/not-a-person is nonbinary but a spectrum, with a fertilized egg rating only a tick above bacteria on the scale, and a newborn close to the top (but not as much a person as a fully formed adult). We've been debating and will continue to debate the threshold at which we're okay with deeming a fetus not a person - I'm not sure that's a debate that will ever end.
Not early on in the pregnancy. Also, the life of someone already born is worth more than the potential life which isn't. If the pregnancy is expected to cause death of another life, then abortion is the lesser evil.
Unless you can with certainty predict the future, this argument is logically inconsistent. Having the child will possibly result in death to one or both of the mother and child. However, it is also possibly that they’ll both live. Having an abortion will increase the probability of the mother surviving, but will certainly kill the child.
The key difference is that a mother may choose to risk her own life, or may choose to end another persons life. The latter is a decision Humans simply do not have the right to make.
