Claiming a right to do what you wish with your own body doesn't apply to someone else's body, and the fœtus is a someone else.
I think it does if that someone elses body is living off your body. It is up to the first person whether they provide nourishment or not
Your argument doesn't counter, or even address, their argument.
I don't really care, when they (most of whom are male) can get pregnant then they can come back and try their argument again
I'd define human as having a human genome -- which would apply even to a zygote.
Shall we say a person then?
That's where the relevant issue lies. Not in a mother's bodily integrity, but in the personhood of the fœtus.
The big sticking point. Luckily the law in civilised countries does not work on bronze age religion and emotion but modern medical facts.