Let's imagine you meet someone and say you want children, they say they do too. You get married a couple of years later and then say, actually I don't want any, sorry. Or, I don't want any for X number of years (which doesn't correspond with your timeline). It's quite a scary thought tbh, how were you able to trust your partner or spouse wouldn't do this? Or did they? Sorry I'm not quite sure how to word it.