By staying away we are protecting our unborn children from being damaged.
i did consider this. the whole "i dodged a bullet" thing.
the fact is, my ex was and is great with kids. i suspect she will be a terrific mother. one of my longest, closest friends has BPD traits, and is, by far, the more stable, loving, consistent parent.
we weren't happy
what helped me is moving from the hypothetical "bullet", to a question of fundamental values.
for example, my ex and i had significant differences religiously. im a christian, and i want to (ideally) raise my children in a christian home, and its important that my partner and i be on the same page in that. my ex is an atheist, had no interest, or even the opposite, of wanting to raise a child that way. so daddy and son or daughter go to church without mommy. big division there. son or daughter want to know why. get in fights with mommy about it. mommy and daddy fight about it. after church, mommy gets her time to explain why its all nonsense and what she believes. thats only fair, right?
additionally, my ex and i fought often, and we fought hard, and it got ugly most of the time. not the loving environment i want my children to grow up in either, ya know?
and i want to have children. i think we would have made a good team in a lot of ways, and an unhealthy team in some very critical ways.
take the facts of the matter - the values differences in your relationship, the dynamics, the unhealthy ways in which you worked as a team. while its a very important consideration, it need not only apply to the prospect of having children, it likely applies in other critical ways to your relationship.