Blueberry bush help ?

I planted a spartan blueberry bush about 2 weeks ago ,that was already growing blueberries in a large planter. I am in PA . To promote growth I pruned it taking old looking branches and started blueberries off. I used organic potting soil + pine bark . And mulched the top only around the stem. I have not... show more I planted a spartan blueberry bush about 2 weeks ago ,that was already growing blueberries in a large planter. I am in PA . To promote growth I pruned it taking old looking branches and started blueberries off. I used organic potting soil + pine bark . And mulched the top only around the stem. I have not fertilized it but have added coffee geinds around the stem byt not near it. I have fish emulsion fertilizer but I'm not sure if I should use it or not. It isnot as bushy as the ones I see in stores and it hasn't grown new clusters. Did I mess it up? Will it grow fruit? Should I fertilize it?
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