the fact that you have nitrate means that you shouldn't have a significant amount of ammonia because your cycle is working.
you may get a little spike right after feeding, a water change, or adding a new fish, but it will quickly be consumed by your biobacteria.
speaking of water change, IMO you should do one to lower your nitrates a bit, as they are not consumed by the biobacteria and can be just as toxic as ammonia and nitrite if they're allowed to build up too much.