I'm sorry to hear you couldn't pass this time.
The question you ask is very specific and it really depends on multiple factors. If you thought the exam went well and despite that you were not successful, then something is not right there. Look at your mark under each specific categories that were sent to you. I would say if you failed by couple of marks you MIGHT want to consider writing the exam in Oct. If the gab is bigger than that, you really need to go back and work on subjects you feel you're not comfortable with them as well as working on your test taking skill which is huge when writing CRNE. If you're working, meantime, you probably need to give yourself more time to get prepared.
I know you're down right now but stay positive. Think of what you've done wrong and how you improve it next time. And that's why you get chance to write exam like this three two/three times, right? To learn from your mistakes and improve yourself. Look at it as you're going to learn more and you will make it. I know a lot of people how passed in their second try.