I just got them stretched for the first time that day! I had to go to see my piercers about my vertical labret, and figured while I was there I might as well do it!
The guy stretched them to an 8g, and my holes were probably a 12g already (from wearing earrings that were a bit heavier), so it was a double stretch. The second step was the one that hurt, and my ears were throbbing a lot after that. But my new plugs look so pretty! Plus now I can put spirals in, so I probably won't stretch them any more than this; if I do it won't be much bigger, maybe the next size up.