Abortion being banned doesn't create more unwanted children. Those children already exist, they are just not born yet. It may even mean less unwanted children as people take better precautions with contraception and are less likely to have sex with someone they aren't committed to.
I'm not against people taking measures to prevent conception, in fact I wish more people would. But when another human life comes into existence, that's when the morality of the situation changes. 2 lives are at stake now.
I don't think that statistically, most abortions are medically necessary abortions. These cases are rare. Most abortions are prompted by lifestyle decisions. In a lot of cases where a mother's health is threatened by continuing the pregnancy, a baby has reached viability and this doesn't need to be killed before the pregnancy is ended to preserve the mother's life.
Yes, I would get an abortion if my life were threatened by an ectopic pregnancy. I absolutely believe in exceptions for the life of the mother, as do almost all pro lifers. You wouldn't exactly be pro life if you expected women to die from preventable causes, to avoid an abortion of a child who is going to die along with her.
Again, these cases are rare, but where abortion bans are in place there must absolutely be very clear laws in place to make sure that a woman is able to obtain an abortion if her life is medically threatened. We need to make sure that doctors won't get into trouble for performing these abortions, and make sure all healthcare staff are aware of the laws in place.