Though I'm not yet a mom, I do have my 2 cents. I personally think that it's nearly impossible & unfair for women to expect themselves to be great moms, great wives & great in their careers 100% of the time. If you are working full time and raising a family- maybe you will be great in these areas, but at what cost? Just remember that both are full time jobs, and the most important will likely be your family. You can do both- but it will be hard. So don't be hard on yourself. Doing your best is sometimes good enough.
If it were me, I would either do school now & wait to have kids, or have kids now & wait to do more school. From what I hear, your babies really need you those early years (and later too, of course). Please at least consider part time work as an option. You will regret it if you aren't able to be there with them due to other responsibilities. As a nurse, you will be fortunate in having more flexibility in career options than most working women do. You will be able to choose various shifts & can work as little or as much as you want. You can work in many different settings, too!
I think it's great that you have given it this much thought. Good luck to you in all your endeavors!