Well, she should understand your logics, because it's pretty clear and simple, besides benefiting her as well after all, as you are doing this for both of you. I'm not sure if we could generalize and put every women on the same basket, as there are women who would be totally comprehensive and support the partner on his decision, while putting her personal desires aside, just like the man is doing, in order to achieve something better for the couple in the future.
It's not wrong and dominant like that and as you said, a woman is also really comprehensive and supports every decision of her partner, but in my opinion it also depends on the woman's mode too, if the timing of the delivery is in a condition where the household's financial condition is safe, that's okay, but If is not yet safe, the perception will be different, especially if the main needs have not been met normally, be it daily household or monthly needs because the number of women is high and their mindset is quite far ahead in this matter.