Suffering From Mirena IUD

I have the mirena iud which had a 5 yr expiration Dec 2013, but because I can t afford to get a new one placed I haven t gone to have it removed. I, nor any partners, have ever noticed the string but all these years I ve not gotten pregnant so assume it s still working as normal. I do have unprotected sex and I m single so there s more than one partner. I ve had 3 previous pregnancies. 1 abortion, 1 hospital induced termination @ 5mos due to baby having cystic hygroma, tturner syndrome, etc. 3rd gave me my daughter- now 6 1/2. Wait so maybe my iud expired in 2012 then? I ve either had no period or what I call a wannabe period the entire duration of the iud. I ve always just known before when I was pregnant. Now I m terribly scared n confused. There s been strange pains, spotting, discharge here n there for several months. Now tho, suddenly I look like I m pregnant, extremely bloated. I m tiny so any big belly from a full stomach goes away but this isn t. No nausea which I ve had w all my pregnancies, no weird cravings, no extra moodiness or breast tenderness. PLEASE HELP!!!