Stretching cartilage? Is it okay this is happening?

ok so i had my cartilage pierced for about 2/3 months n the guy said i only needed to wait 6 months to change it so i changed it and yes i got it with a gun ik its bad but my ear was fine so i changed the earring sunday night n it ddnt hurt at all it went right in and there is really little or no puss forming from the ear its a tiny bit swollen in the back of the ear n theres taht bubble that all my friends sed they got when they changed their earrings but its just a little soar too feels like the first time i got my ear pierced so can i keep it in and my ear will get used to it? please help thankz!