Pregnancy causes bodily harm to the woman and can kill her. Therefore, she has the right to defend herself from it just as you would have the right to defend yourself from an intruder in your home or an attacker on the street.
If women-who are considered persons under the law-have no right to refuse the use of their bodies to an insentient fetus which ISN'T a person under the law, what's to stop misogynists from taking it a step further and making it illegal for women to refuse men the use of their bodies as well?
The cold hard truth of the matter is that fetuses actually have the same right to use a woman's body as any BORN person does...which is ZERO. They DO have equal rights. Some just want to elevate their rights to be above born people and the women that actually risk their health and lives carrying them.