You dont want to add fish then have them die because of an ammonia spike. I would get an ammonia test kit and some Prime just in case. I think your fine but a backup plan is always a good thing. When things go south its never at a good time.
Just take your time and let it do it's thing. If you go and start messing with the cycling with Prime and other chemicals it may prolong your cycle period. I know it's nerve wracking, we've all been through it.