String Location?

Emily • Happily married want-to-be mermaid
I'm really awful at remembering to check for my IUD strings. So awful in fact that I've only successfully found them twice in two years. 
I used to check for them all the time but then my fiancé kept feeling the strings so we had them cut and now they're much harder to feel. Once I had to feel around for no joke ten minutes until I barely stumbled across them and the second I was masterbating an happened across them. 
Today I remembered to check for them and it took my a really long time to find them. They didn't feel like where I would've imagined they'd be, and since the other times I only happened upon them I couldn't really compare them.
Please bare with me and help me out here! I was laying down on my back, and the strings were kinda off to the left, and farther down (like vertically) than I would've thought they should be. 
I'm in no pain or discomfort at all I just have nothing to compare it too so I don't know if this is normal. Can anyone help me out here?