If there was nothing in the pond prior to stocking the fathead minnows, you should be seeing them (if enough were put in and, then survived the stocking).
If, for some reason you didn't have survival of the fatheads and/or the emerald shiners, then any Yellow Perch you put in may not have anything to eat.
Also, you'd want any bait fish to spawn before stocking predator fish like Yellow Perch, and if you only stocked them this past winter, you''d only have spawning in the next few months.
