Being pro-choice means creating a world where every person who is pregnant can make a decision free of any form of coercion whether or not they want to continue the pregnancy.
The welfare reforms proposed by National are economic coercion.* Supporting women (and all pregnant people's) right to choose, means opposing these reforms and going further and demanding (among other things) a living wage for women on the DPB.
I'd like to say more about the 'reforms' themselves and explain why they aren't actually about getting women on the DPB into work, but misogyny and punishment. But all I have time for is this:
[Text "Want a job, Bro?" "You know I can't do your ghost jobs, John" for context see youtube]
* As are the current DPB levels which were deliberately set at levels that were unable to buy adequate food