Premeds with no experience who go to med school also get a very intensive residency after med school, which most NP programs don't. So just something to consider.
But, 2 years post grad seems to be a pretty common time for people to go back to school. Because most people will continue gaining bedside experience while they're in NP school, which means at least two additional years of practice before becoming an NP.
So I think that if you feel comfortable with your knowledge and skills now, and this is a good time in your life to go back to school...go for it.
(I've been a nurse for going on four years now, and am re-re-reconsidering starting this summer or fall, hehe.