If I switch my nose ring from a 18g to a 20g before it's healed,will I be abIe to shrink the hole?

and need it to be nearly invisible when taken out. I asked the jeweler is she had any smaller rings, but she said that 18 guage was standard and anything smaller would rip. After I was pierced I did some research online and found that the 20 gauge is actually smallest. This pissed me off. MY QUESTION IS!!!!! If I get my nose jeweler switched to a 20g now, will it heal into a smaller size, or have tons of scar tissue and look deformed. My nose has only been pierced now for 2 days.