Copper IUD & Bleeding?

Sam
HELPME
I have had the copper IUD for over a year now, and when I had my 6 month check up, my GYNO said that it sits low in my uterus, but it's nothing to worry about if the strings are in same place, it's not causing any pain, etc. 
BUT- I noticed last week when doing a specific pose in yoga, I feel I sharp pain near my hip flexor. Last yoga class I started bleeding really heavy after doing that pose and feeling that pain. My period doesn't start for two weeks. It's a medium flow.
Has this happened to anyone else?
Is this displacement of my IUD? Would I be in more pain?
Thoughts?