Girl. Omg. As a woman rounding 30 myself, I can physically feel the baby rabies in your post, lol, and it's kind of stressing me out on a personal level. What is it about the age of 30 that is scaring you in terms of just beginning to start a family? I think you need to answer this for yourself and see how you feel about what you find out.
If you know of specific medical issues you have that may contribute to difficulty conceiving, I can totally understand your concern. However, I think that having your first child around 30 probably wouldn't be as rough as you anticipate. Sure, your parents will be older - two years older than the timeline you seem to be pushing, which honestly isn't that much. If they are able and willing to help, they will do so at any age. But, you're the parents! It's all you guys, so you have to make sure that YOU are in a physical, financial, and spiritual place to have children. Only the two of you can determine what needs to happen before you do this. I have to say, being about to turn this age you seem to be wary of, I feel MUCH more prepared for the reality of having more than just me and my boyfriend to take care of - even more than just a couple years ago. Having the opportunity to get our careers underneath us, figure out where we want to live, and just be together has been very valuable and will play an instrumental role in our family life if we do decide to have kids.
I don't think there's any hard rule about the time between NCLEX and getting a job, but it's a good idea to start something relatively soon, for your own benefit. That way you'll liketo what you've learned in school fresh and start to build on that knowledge.
Another thing to consider is that nursing school is rough. People have totally had kids in the middle, pushed through, and become kickass nurses! I know that for me, I would have lost my mind and had a lot of trouble finishing. It is already going to cut into your time with your BF; can you imagine dividing what little free time you have even further in order to care for an infant? I think the benefit of waiting until you graduate is that you and BF can catch up, save some money, and just be you guys again, and really get your relationship ready for this big change.
I feel your pain; baby fever is real and it is wild. What I keep reminding myself is that I don't want to steal the joy of this experience from myself by pushing it too early. If there are solid reasons to wait a couple years and only baby fever as justification for doing it sooner, I think it's worth it to stick it out. But only you and your boyfriend can decide your priorities.
Sorry for the stream-of-consciousness post, lol, but hopefully it helps you further develop your thoughts and plans in a constructive way!