Yes you can do it in ONLY 5 semesters, however, please don't take any offense to this, 5 semesters in a tough nursing program compared to psych classes is much different. you will have no life for 2 years and when I mean no life, I mean any of your time off is consumed by studying, learning, practicing, or being in nursing school :)
Why do you want to do nursing if you recently just graduated with a psych degree? nursing is quite different field. also just as an fyi many new grads are having much difficulty finding jobs.