Kids and money are the biggest reasons for divorce. Get on the same page about both while you're dating. If someone can't handle an open conversation, they won't make a good partner.
Probably means an open and honest conversation. Question vis-a-vi: Do you want kids? If we can't have kids without IVF do we do it? If IVF with our own gametes fails do we use donors? What if we cannot afford it? Do we adopt?
Will you be an equally contributing parent? How will we raise them? Religion? Vaccines? Education.. All those things... It's a lot to parse. Expectations of parenthood.