Abortion is such a philosophical conundrum.
Fetuses are biologically human, biologically alive, and thus should have a right to life.
A woman also cannot be forced to donate her body for it.
(Except in all the ways the state already does force people *cough*parental responsibility*cough*child support*cough*)
Let's look at it from a practical matter, though. Is banning all abortion feasible? No, of course not. People will find a way as they had before, with disastrous results. Is allowing all abortions feasible? Well tossing late-term infants into dumpsters seems harsh and cruel, and by that point you ought to have already decided whether to keep it or not, barring physical health risks to the mother or infant.
So we need to draw a line somewhere. An arbitrary line of personhood is a rabbit hole (and being legally consequent even more so). There's no universal consensus and there is little science to "detect" personhood.
What we can do is let technology answer it for us: how soon can you take out a fetus and put it in the latest artificial "womb" and expect it to survive to term? And how early can a mother reasonably detect with certainty a pregnancy with the current technology?
We have two scenarios: regular and irregular pregnancies.
Irregular pregnancies are all the pregnancies where there is a risk to the mother's physical health by X standard deviations above the mean, or where the fetus is already dead or is sick enough that survival is unlikely.
Abortion of these ones should be always be allowed, and all efforts should be taken to rescue the aborted fetus, if possible.
Regular pregnancies are all the others, including rape (regular from a biological standpoint) and incest (barring sickly fetus). Abortion of these ones concern more about the consent of pregnancy than anything else.
This is where technology comes in. Abortion for any reason should be allowed if the decision to abort is made before the abortion deadline, and all efforts should be taken to rescue the fetus, if possible. That deadline is 30 days (or whatever is standard for a legal document sent to court) after the earliest possible time that the fetus can be put in an artificial womb, or 30 days after the earliest possible time a mother can reasonably detect with certainty a pregnancy with current technology. Whichever date is later is the deadline and is updated every Y years following a technological assessment.
This is less a philosophical and more a practical and future-proof version of abortion law. As technology develops, the deadline creeps closer to conception + 30 days. Which is just fine since that technology gives you enough information in time for you to make up your mind on whether you want to keep the baby or not. Naturally, the law should ensure that access to said technology is possible for everyone at little cost.