Can you get pregnant while on........

Hey ladies I would like to know if anyone here has experienced getting pregnant while on the IUD? Or has known someone that went through getting pregnant while on the IUD? I have the IUD and have some of the pregnancy symptoms I had with my last baby boy. Having to poop in the mornings that I cant hold it , headaches on and off and getting some emotional and irritation moods . I've also been pretty wet in the girly area . Sorry Tmi. Any advice or experience would be helpful .