well if its like the size of a piercing stud its eith a 16 guage or a 14 guage, pretty small, my hoops are about as thick as a pencil, maby a lil smaller but tats a 2 guage a ten guage is about the thickness of an ink cartridge in a standard bic pen(u know that thin ink filled thing when u pull it out of the main part). so from there if u have a pretty good idea of what it iz, u wont want to skip more then 1 or maby 2 guages, but skipping guages before its completely healed can be a lil painful so enjoy it. if u stretch it anytime soon though ull most likely push the front part of the hole out the back tearing it a lil bit.

when ur earring doesnt get that crusty shit on it anymore its probably ok to stretch, but dont pick that shit off, take a shower so it gets soft, take out ur earring and wash ur earring with water. basicaly if u wake up and there iz no crust at all, stretch it