You'll definately have to take more classes after you gain your RN. If you at planning on taking the nursing program at the school you're currently at (talked to you before we go to the same school

) You'll have to take a RN to BSN bridge (Metropolitan State, UofMN, NAU, Argosy, etc offer these). From there you would have to apply and get into a Nurse Midwife program. The only school in MN that offers this is UofMN.
Yeah, I've kind of researched this a little as I've considered this route as well.