I have explained this in a post above. The blastocyst mindlessly implants into the woman's endometrial tissue by penetrating into it. It takes some of that tissue, which belongs to the woman, to make a placenta. It directs that placenta to kill some of the T-cells of the woman's immune system by producing hCG, cells that protect her body from viruses and infections, and to produce an enzyme, indoleamine 2, 3-dioxygenase, which catabolizes the local amino acid L-tryptophan in her body, the basic nutrient of those cells, and thus to starve those cells, which have to go into latency to survive, a state in which they cannot reproduce or function to protect her from viruses and infections. It directs that placenta to re-channel her blood so that it is accessible to the embryo it becomes, and it then takes oxygen and nutrients out of her blood which would otherwise serve her body's well being. It puts its toxic waste into her blood and leaks not only its own cells but also isolated chromosomes, including chromosomes which did not come from her, into her blood.
This behavior might be okay if she had consented to it, but if the woman did not consent to pregnancy, this is assault, and specifically assault in one of her sex organs (the uterus), and robbery (taking her tissue, oxygen, and nutrients without permission). You cannot claim that the woman consented to pregnancy when she consented to sex, because the human being she had sex with is, if the embryo is a distinct human being, not the same human being that had sex with her. Hence, the woman has every right to say that the blastocyst/embryo has no right to implant in her tissue, use her tissue, attack her immune cells, kill some of her immune cells, starve her immune cells, re-channel her blood and take things out of it and put other things into it.
In NY state law, the laws of some other states, and, as I understand it, in federal law, a person has a right to defend himself/herself against what he/she perceives to be a threat of rape, sexual assault, kidnapping, or robbery, or to stop an actual rape, sexual assault, kidnapping, or robbery and to use deadly force if necessary to prevent or stop it even if one knows that one's life is not being threatened. And those same laws allow a third party the right to help defend that person and to use deadly force if necessary to prevent or stop one of those crimes.
So I think this supports the claim that, if a woman has not consented to a particular pregnancy with a particular zygote/morula/blastocyst/embryo/fetus, she has the right to use deadly force if necessary to stop it and a third party has the right to use deadly force if necessary to help stop it.