nipple piercing migration

Okay I got these puppies about a week and a half ago. I noticed the left one has like a groove along the piercing hole. I sleep on my left side and I am left handed. It is towards my cleavage v. my arm o.o it doesnt hurt or anything. just looks funny. did it migrate? is it fine?

I clean it 3 times a day with sea salt 1/4th tea spoon and i clean it with anti bacterial soap when i shower o.o