Talk about "begging the question" as a fallacy. This "argument" assumes there's only one body involved, the mother's. The unborn child's body is also involved. More than "involved". Remember, in the ham and eggs breafast the hen was involved but the pig was committed. Here the unborn child's entire life is decided and he/she gets no say.
There's another unheard voice, too. The father's. If a man and woman conceive, she may kill the unborn child or decide to have it with the man being held financially responsible. He has no say, no voice, no "choice" in the matter. Men, stand up for your rights.
That is why the "choice" for men and women is before you have sex. I told my boys when they were growing up that the choice of having sex out of wedlock may affect you for the rest of your life. If you get a girl pregnant and you do not marry her, their Dad and I would insist they do so, then you will for the rest of your life have to deal with the mother of your child, till the day you die you will be involved with her. Make the right "choice".