I didn't know, but according to your relativist system of morals I could just kill anyone and disobey the law as it pleases me. Just because "Nobody has the right" to impose things on me
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Society needs to impose basic rules unless the goal is to have an anarchy that will end in more oppression than those crying for freedom would like.
As for the pro-choicers who use the right of the mothers, I can argue their arguments are flawed. The fertilized egg is a lifeform, a human both in name and practice; while they might still not look like a grown up human, they're already basic humans themselves.
Just because they're still in an early stage of life, doesn't mean we can kill them; by this reasoning I would kill children too, just because they just "aren't" like grown up people, so they don't deserve to live.
The woman has no choice, and great! Because if we applied the flawed logic of "mother's rights" then I could kill everyone too, just because I don't like them or they disturb my life. If a woman likes a promiscuous lifestyle, then she might very well go to the nearest store and buy a couple of contraceptives. That she has the right to do; but to let something into her womb just to kill it while it's alive and in development, it's just perverse and should be illegal. Can the foetus, "the parasite", stop the mother and decide to live? No! It's defenseless, and the mother wants to kill it just because she finds it "incovenient". You know, this has a name: Murder.