A fetus, at conception, is a cluster of cells. This is not a human, and giving it the same rights as humans would ban abortion. In some cases, banning abortion would, in essence, perhaps not "kill" the fetus, but it may ruin the mother's life and future, therefore "killing" her, as she must give up her life to carry a child she is not prepared for. If she was raped, and was impregnated, the product of sexual assault does not need to be granted rights. It is a clump of cells, not a living, breathing human like the mother.