Belly on Piercing..Infected?

ok. So i kno i did something wrong....i changed my belly on ring after a month, mainly because the barbell the piercer gave me waz cheap, and i lost the top of the ball..so i had no other choice but to replace it. Since i've replaced it, the piercing hurts..tender...theres no puss tho..but its just sore...is it infected? or did i just lengthen the healin process and thats the reason its hurting? or bruise it..in some way