We seem to be talking about different things here: science and the scientific method. Science is a process involving many different institutions and individuals with their personal worldviews, problems and interests. The state of the scientific method is a whole other discussion, I am not able to lead.
A (human) mother that carries a growing fetus is a living being. A pig, dog or a cow as well. They feel physically and emotionally and can be hurt.
A fetus is, up to a certain point, just a slab of meat.
As a vegan I don’t care about slabs of meat, I care about living beings and I think we shouldn’t hurt them.