nipple piercings

Kim
Currently freaking out. I've have my piercings for 4 months now and the ball just fell off one of my bars. The ball is currently missing and I have nothing else to replace it with. I don't have time to go to the store and buy a new one either. I have two other pairs but they are 14g and undoubtedly mine are smaller cause the bar will not fit through. I'm freakin out cause I don't want to lose the bar and it grow up. Anyone got any advice to give me? What is a temporary fix till I can get new ones?