Those looking for a long-term relationship often discuss (not) having children in the somewhat early stages of dating. That in no way means that one should start planning a family with a person they’ve been on three dates with; but having at least a brief conversation about it some more dates later might be a good idea.
That’s because people might have different expectations and it’s important for a couple to be on the same page if they want things to last. Unfortunately, for this redditor they didn’t, as her husband revealed he has two kids, which was something she never wanted herself.