They counter that you want to kill unborn babies. You counter that by either arguing that technically they're not actually human yet or that women's autonomy is more important. They disagree. You disagree. Brilliant segue.
I think you're leaving out the part where one group feels like they can intervene in someone else's life and decisions about health based on a difference of opinion. The default should be "we disagree, you do you and I'll do me".
In their eyes, you’re intervening in the life and health of the baby based on a difference of opinion (you don’t want a baby).