"Women's rights," "women's bodies," etc. are just canards in the abortion debate
What really happens at conception, however, is the advent of a new human life, a separate human/body/person/individual from its mother.
At the time of conception there are trillions of original cells in the body of the mother, and all of them possess the same 23 pairs of chromosomes intrinsic to the mother alone. Only one cell, however, that of the zygote, possesses a chromosome makeup that is not the same as those other trillions of cells. It is clear from then on, that there are two separate human organisms, one gestating inside the other. Some months down the line, this zygote is a fully-fledged human being with all his/her human rights.
So abortion is not only the question of women's rights. In my opinion, the women's rights in this case are of secondary importance.