@thatwasme22
If a man were to ask this he'd be roasted.
Sure he would! ... because our society does not currently place equal value on the contribution of homecare, and childcare and earning cash.
We really do live in a world where money is the only way for a woman to escape (family unlikely to be willing or able to rescue her and the children until adulthood), and where men do still earn unequally large pay (just see the Asda issue right now). It is absolutely essential that this woman considers the extent to which she is vulnerable in this society, and this marriage, through the very nature of being part-time at work in favour for childcare.
If the marriage is loving and equal and kind and communicative she would not be asking this. But I realise that most relationships are about navigating through stuff - mountains of it.
The trick is always to do that without feeling used or vulnerable or controlled, and for the other party to avoid wanting a partner to feel that, rather than just crowing over a "win" and being in charge. Each partner needs to be completely informed of what is happening, and to find a way to consent in even a time-limited way to something.
The OP is agreeing about her dis-honesty/non-disclosure, and lots of the posters here are wondering about "Why?" she needs to do that. She may be passive aggressive about her negotiations with DH and/or just unwilling to stand her ground .... or scared to do so.
Getting her, and all of us here, to consider these issues is important.
We have to constantly ask - "What is the difference between organising ourselves around the needs of others so that we can form happy communities and rub along together well, and doing so to the detriment of ourselves so that we are smaller, or quieter or not as much of a person as we can be?"