Bump by bellybutton piercing?!?

Its a bump by the piercing site that I just felt, under the skin! I use a salt spray that I bought from the piercing store to clean my bellybutton piercing, I just got it pierced yesterday and I don't want my body to reject it..its not exactly noticeably at all, around the piercing area its a little red, but not really at all! So help would be appreciated