I just took my NCLEX-PN in California just this May too! My guess is you don’t have to pay the fee to apply to retest UNLESS your eligibility to take the NCLEX has expired. You should have a letter (which I hope you kept just in case) that notes the expiration date that’s 6 months after your eligibility date.
So if you know your eligibility hasn’t expired, I think you only need to worry about the exam fee.
Hope this helps!