Pregnant on mirena iud?

Hi I was wondering if anyone has got pregnant while have mirena? If so what were you symtoms like. I've had the mirena for almost 2 years. I had a baby June 2015 and had mirena inserted ASAP .I breast fed my baby for over a year so I didn't have any periods. I started weaning him from breast feeding so my period came back. My period came back on my usual cycle the end of the month. And it has been reguarl except the last 2 months it has been light and longer . im concerned because I always have a regular period the end of the month for 7 days. Now I don't know when my periods are. And when I do "bleed" its very light I don't even fill a tampon its more like spotting. I have had all sorts of pregnancy systems from fatigue, nausea, food cravings, tender breast and being moody. I even cried over some food which I never done unless I was pregnant . I have been cramping on my lower left side for 3 weeks now. I've made a Dr. Appointment next Tuesday to have this removed. Im either pregnant or its fucking with my emptions. I just don't know my body anymore. If any one has experienced this please reply Lol.