A fetus is only potential life. Regardless of whether or not a fetus has personhood in any sense doesn’t change the fact that one person has no right to use another person’s body without his or her permission, as a fetus is doing in its mother’s womb. Even if, for example, science makes it possible for a fetus to be viable from inception, so long as it is part and parcel of the mother, she holds the right to terminate or continue with the pregnancy.
As an Orthodox Jew, I personally follow the halakha (Jewish law) that a woman may only have an abortion if the fetus is posing a danger to her life or health. However, as a feminist activist, I hold the belief that it is a woman’s right to have abortion access without restrictions, regardless of how I would comport myself in my personal life.