Thinking of dropping out of grad school

I am enrolled part time in grad school, going for FNP. I work full time nights and have a lot going on in my personal life right now. Most of it, wonderful things! I'm getting married in a MONTH, we just moved into our first home together (still getting used to being a homeowner!), my 18 yr old sister just brought her beautiful baby girl home from the hospital (which I have been helping out alot!). With school and everything else, I never have time to clean my house or cook or even look at the flowers I planted! It's so depressing! Today, I am going up to school to drop my summer class because of all that is happening this summer. It's just TOO much. But, now I'm pondering whether I should even go back. If I continue in school part time, it will take me 4-4.5 years to complete. My fiance and I would then try to start a family since I think being in school and working full time and having a baby wouldn't mix too well. Now that I am around my niece, I don't know that I want to be in school and wait 5 years or so to have kids! I want to have children sooner! I'm at a loss and just don't know how to go about making this decision.