I was married 7 years before having my first child, which was by choice, and got thoroughly fed up with questions, not from my mum but from others who initially assumed we could/would have a baby, but as time went on 'assumed' there were medical problems, and later still was told how selfish i was not to have children, and on and on it went, ad nauseum. we were living in a rented flat and saving hard to get a deposit for a small house so both of us needed to continue working. no help from mum and dad then.
If they wanted to talk to you about it they would have done but as others have said, people wait a lot longer these days. May not be entirely sensible for the woman as the clock ticks, but where most of us left school early, met and married early and had children early, they have stayed at school longer, had gap years, done university degree/s, had another gap year, so everything is much later these days. I was out to work at l5, probably a full l0 years earlier than most young people today (and 20 years later got my degree too, but without the gap years ).