IUD: one string or two strings

Hi all, I had my copper IUD put in a week ago. I checked my "strings" a couple days after but I was a big baby and only felt one and stopped searching because i was a little sore, plus I have small hands... lol. So anyway, today I thought I'd give it another try but took more time in finding them. I only felt one and it's like a loop, like it was tucked in another part of my cervix kind of. I didn't want tug or try to feel for the end of it as that sounds dangerous... anyway, I only felt one string. Is this normal? Per my google search I see plural and non plural use of the word string.