I have been on Mirena for 4 years now, just about. All of the things I've read talk bout how people who get pregnant on the iud miss their period. But I don't get mine because of mirena. Lately I have been having pregnancy symptoms, like I have been gaining weight, my breasts have become sore, I have heartburn, and weird cravings. I have to pee every half an hour to hour and my back always hurts. Am I just paranoid? Or is it possible that I am pregnant? Help! If you need more info, ask me.