ive had mirena since march 09 after it got inserted i bled for 3 ...

ive had mirena since march 09 after it got inserted i bled for 3 weeks then spotted for another then bleed again for another couple weeks until last week and now this week ive been feeling super nauseous everyday has anyone had this happen im worried that i may be pregnant b/c my bf used to say he could feel the mirena when we have sex be the other day when we did he said he didn't feel it is that normal and has anyone had similar things happen im so scared im pregnant and need some reassurance!